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Finding the Fourth Proportional to 60,487.28, 90,702.30 and 21,039.48

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Solution

The fourth proportional to 60,487.28, 90,702.30 and 21,039.48 is: 31,549.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,487.28 : 90,702.30 = 21,039.48 : x
  2. Step 2: Convert to fraction form
    60,487.28/90,702.30 = 21,039.48/x
  3. Step 3: Cross multiply
    60,487.28x = 90,702.30 × 21,039.48
  4. Step 4: Simplify right side
    60,487.28x = 1,908,329,226.80
  5. Step 5: Solve for x
    x = 1,908,329,226.80/60,487.28
  6. Step 6: Final answer
    x = 31,549.27

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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.