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Finding the Fourth Proportional to 8,491.60, 12,740.12 and 5,390.92

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Solution

The fourth proportional to 8,491.60, 12,740.12 and 5,390.92 is: 8,088.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,491.60 : 12,740.12 = 5,390.92 : x
  2. Step 2: Convert to fraction form
    8,491.60/12,740.12 = 5,390.92/x
  3. Step 3: Cross multiply
    8,491.60x = 12,740.12 × 5,390.92
  4. Step 4: Simplify right side
    8,491.60x = 68,680,967.71
  5. Step 5: Solve for x
    x = 68,680,967.71/8,491.60
  6. Step 6: Final answer
    x = 8,088.11

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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.