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Finding the Fourth Proportional to 60,499.80, 90,728.10 and 21,058.20

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Solution

The fourth proportional to 60,499.80, 90,728.10 and 21,058.20 is: 31,579.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,499.80 : 90,728.10 = 21,058.20 : x
  2. Step 2: Convert to fraction form
    60,499.80/90,728.10 = 21,058.20/x
  3. Step 3: Cross multiply
    60,499.80x = 90,728.10 × 21,058.20
  4. Step 4: Simplify right side
    60,499.80x = 1,910,570,475.42
  5. Step 5: Solve for x
    x = 1,910,570,475.42/60,499.80
  6. Step 6: Final answer
    x = 31,579.78

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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.