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Finding the Fourth Proportional to 71,430.78, 98,564.12 and 39,599.68

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Solution

The fourth proportional to 71,430.78, 98,564.12 and 39,599.68 is: 54,641.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,430.78 : 98,564.12 = 39,599.68 : x
  2. Step 2: Convert to fraction form
    71,430.78/98,564.12 = 39,599.68/x
  3. Step 3: Cross multiply
    71,430.78x = 98,564.12 × 39,599.68
  4. Step 4: Simplify right side
    71,430.78x = 3,903,107,611.48
  5. Step 5: Solve for x
    x = 3,903,107,611.48/71,430.78
  6. Step 6: Final answer
    x = 54,641.82

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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.