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Finding the Fourth Proportional to 61,809.30, 86,729.85 and 61,809.30

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Solution

The fourth proportional to 61,809.30, 86,729.85 and 61,809.30 is: 86,729.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,809.30 : 86,729.85 = 61,809.30 : x
  2. Step 2: Convert to fraction form
    61,809.30/86,729.85 = 61,809.30/x
  3. Step 3: Cross multiply
    61,809.30x = 86,729.85 × 61,809.30
  4. Step 4: Simplify right side
    61,809.30x = 5,360,711,317.61
  5. Step 5: Solve for x
    x = 5,360,711,317.61/61,809.30
  6. Step 6: Final answer
    x = 86,729.85

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.