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Finding the Fourth Proportional to 72,149.59, 99,564.97 and 39,885.57

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Solution

The fourth proportional to 72,149.59, 99,564.97 and 39,885.57 is: 55,041.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,149.59 : 99,564.97 = 39,885.57 : x
  2. Step 2: Convert to fraction form
    72,149.59/99,564.97 = 39,885.57/x
  3. Step 3: Cross multiply
    72,149.59x = 99,564.97 × 39,885.57
  4. Step 4: Simplify right side
    72,149.59x = 3,971,205,580.48
  5. Step 5: Solve for x
    x = 3,971,205,580.48/72,149.59
  6. Step 6: Final answer
    x = 55,041.28

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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.