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Finding the Fourth Proportional to 91,418.80, 137,128.20 and 56,244.40

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Solution

The fourth proportional to 91,418.80, 137,128.20 and 56,244.40 is: 84,366.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,418.80 : 137,128.20 = 56,244.40 : x
  2. Step 2: Convert to fraction form
    91,418.80/137,128.20 = 56,244.40/x
  3. Step 3: Cross multiply
    91,418.80x = 137,128.20 × 56,244.40
  4. Step 4: Simplify right side
    91,418.80x = 7,712,693,332.08
  5. Step 5: Solve for x
    x = 7,712,693,332.08/91,418.80
  6. Step 6: Final answer
    x = 84,366.60

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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.