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Finding the Fourth Proportional to 90,720, 124,863.12 and 79,893.81

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Solution

The fourth proportional to 90,720, 124,863.12 and 79,893.81 is: 109,962.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,720 : 124,863.12 = 79,893.81 : x
  2. Step 2: Convert to fraction form
    90,720/124,863.12 = 79,893.81/x
  3. Step 3: Cross multiply
    90,720x = 124,863.12 × 79,893.81
  4. Step 4: Simplify right side
    90,720x = 9,975,790,385.29
  5. Step 5: Solve for x
    x = 9,975,790,385.29/90,720
  6. Step 6: Final answer
    x = 109,962.42

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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.