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Finding the Fourth Proportional to 8,688.38, 11,980.46 and 6,454.40

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Solution

The fourth proportional to 8,688.38, 11,980.46 and 6,454.40 is: 8,900.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,688.38 : 11,980.46 = 6,454.40 : x
  2. Step 2: Convert to fraction form
    8,688.38/11,980.46 = 6,454.40/x
  3. Step 3: Cross multiply
    8,688.38x = 11,980.46 × 6,454.40
  4. Step 4: Simplify right side
    8,688.38x = 77,326,648.75
  5. Step 5: Solve for x
    x = 77,326,648.75/8,688.38
  6. Step 6: Final answer
    x = 8,900.01

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.