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Finding the Fourth Proportional to 90,513.92, 124,988.56 and 56,580.40

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Solution

The fourth proportional to 90,513.92, 124,988.56 and 56,580.40 is: 78,130.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,513.92 : 124,988.56 = 56,580.40 : x
  2. Step 2: Convert to fraction form
    90,513.92/124,988.56 = 56,580.40/x
  3. Step 3: Cross multiply
    90,513.92x = 124,988.56 × 56,580.40
  4. Step 4: Simplify right side
    90,513.92x = 7,071,902,720.22
  5. Step 5: Solve for x
    x = 7,071,902,720.22/90,513.92
  6. Step 6: Final answer
    x = 78,130.55

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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.