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Finding the Fourth Proportional to 99,521, 137,343.42 and 58,686.78

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Solution

The fourth proportional to 99,521, 137,343.42 and 58,686.78 is: 80,990.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,521 : 137,343.42 = 58,686.78 : x
  2. Step 2: Convert to fraction form
    99,521/137,343.42 = 58,686.78/x
  3. Step 3: Cross multiply
    99,521x = 137,343.42 × 58,686.78
  4. Step 4: Simplify right side
    99,521x = 8,060,243,073.99
  5. Step 5: Solve for x
    x = 8,060,243,073.99/99,521
  6. Step 6: Final answer
    x = 80,990.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.