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Finding the Fourth Proportional to 60,509.76, 90,773.28 and 18,960

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Solution

The fourth proportional to 60,509.76, 90,773.28 and 18,960 is: 28,442.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,509.76 : 90,773.28 = 18,960 : x
  2. Step 2: Convert to fraction form
    60,509.76/90,773.28 = 18,960/x
  3. Step 3: Cross multiply
    60,509.76x = 90,773.28 × 18,960
  4. Step 4: Simplify right side
    60,509.76x = 1,721,061,388.80
  5. Step 5: Solve for x
    x = 1,721,061,388.80/60,509.76
  6. Step 6: Final answer
    x = 28,442.71

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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.