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Finding the Fourth Proportional to 8,684.76, 11,985.08 and 5,280.76

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Solution

The fourth proportional to 8,684.76, 11,985.08 and 5,280.76 is: 7,287.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,684.76 : 11,985.08 = 5,280.76 : x
  2. Step 2: Convert to fraction form
    8,684.76/11,985.08 = 5,280.76/x
  3. Step 3: Cross multiply
    8,684.76x = 11,985.08 × 5,280.76
  4. Step 4: Simplify right side
    8,684.76x = 63,290,331.06
  5. Step 5: Solve for x
    x = 63,290,331.06/8,684.76
  6. Step 6: Final answer
    x = 7,287.52

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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.