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Finding the Fourth Proportional to 91,480.71, 137,220.91 and 47,120.15

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Solution

The fourth proportional to 91,480.71, 137,220.91 and 47,120.15 is: 70,680.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,480.71 : 137,220.91 = 47,120.15 : x
  2. Step 2: Convert to fraction form
    91,480.71/137,220.91 = 47,120.15/x
  3. Step 3: Cross multiply
    91,480.71x = 137,220.91 × 47,120.15
  4. Step 4: Simplify right side
    91,480.71x = 6,465,869,058.43
  5. Step 5: Solve for x
    x = 6,465,869,058.43/91,480.71
  6. Step 6: Final answer
    x = 70,680.14

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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.