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Finding the Fourth Proportional to 385,956.60, 579,019.98 and 129,780.42

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Solution

The fourth proportional to 385,956.60, 579,019.98 and 129,780.42 is: 194,699.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,956.60 : 579,019.98 = 129,780.42 : x
  2. Step 2: Convert to fraction form
    385,956.60/579,019.98 = 129,780.42/x
  3. Step 3: Cross multiply
    385,956.60x = 579,019.98 × 129,780.42
  4. Step 4: Simplify right side
    385,956.60x = 75,145,456,192.79
  5. Step 5: Solve for x
    x = 75,145,456,192.79/385,956.60
  6. Step 6: Final answer
    x = 194,699.24

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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.