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Finding the Fourth Proportional to 8,345.40, 12,518.10 and 8,287.80

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Solution

The fourth proportional to 8,345.40, 12,518.10 and 8,287.80 is: 12,431.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,345.40 : 12,518.10 = 8,287.80 : x
  2. Step 2: Convert to fraction form
    8,345.40/12,518.10 = 8,287.80/x
  3. Step 3: Cross multiply
    8,345.40x = 12,518.10 × 8,287.80
  4. Step 4: Simplify right side
    8,345.40x = 103,747,509.18
  5. Step 5: Solve for x
    x = 103,747,509.18/8,345.40
  6. Step 6: Final answer
    x = 12,431.70

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.