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Finding the Fourth Proportional to 60,695.20, 91,042.80 and 21,239.20

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Solution

The fourth proportional to 60,695.20, 91,042.80 and 21,239.20 is: 31,858.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,695.20 : 91,042.80 = 21,239.20 : x
  2. Step 2: Convert to fraction form
    60,695.20/91,042.80 = 21,239.20/x
  3. Step 3: Cross multiply
    60,695.20x = 91,042.80 × 21,239.20
  4. Step 4: Simplify right side
    60,695.20x = 1,933,676,237.76
  5. Step 5: Solve for x
    x = 1,933,676,237.76/60,695.20
  6. Step 6: Final answer
    x = 31,858.80

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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.