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Finding the Fourth Proportional to 342,572.80, 513,859.20 and 105,939.40

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Solution

The fourth proportional to 342,572.80, 513,859.20 and 105,939.40 is: 158,909.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    342,572.80 : 513,859.20 = 105,939.40 : x
  2. Step 2: Convert to fraction form
    342,572.80/513,859.20 = 105,939.40/x
  3. Step 3: Cross multiply
    342,572.80x = 513,859.20 × 105,939.40
  4. Step 4: Simplify right side
    342,572.80x = 54,437,935,332.48
  5. Step 5: Solve for x
    x = 54,437,935,332.48/342,572.80
  6. Step 6: Final answer
    x = 158,909.10

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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.