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Finding the Fourth Proportional to 61,191.60, 91,981.80 and 57,692.40

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Solution

The fourth proportional to 61,191.60, 91,981.80 and 57,692.40 is: 86,721.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,191.60 : 91,981.80 = 57,692.40 : x
  2. Step 2: Convert to fraction form
    61,191.60/91,981.80 = 57,692.40/x
  3. Step 3: Cross multiply
    61,191.60x = 91,981.80 × 57,692.40
  4. Step 4: Simplify right side
    61,191.60x = 5,306,650,798.32
  5. Step 5: Solve for x
    x = 5,306,650,798.32/61,191.60
  6. Step 6: Final answer
    x = 86,721.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.