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Finding the Fourth Proportional to 386,281.80, 579,422.70 and 136,931.40

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Solution

The fourth proportional to 386,281.80, 579,422.70 and 136,931.40 is: 205,397.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,281.80 : 579,422.70 = 136,931.40 : x
  2. Step 2: Convert to fraction form
    386,281.80/579,422.70 = 136,931.40/x
  3. Step 3: Cross multiply
    386,281.80x = 579,422.70 × 136,931.40
  4. Step 4: Simplify right side
    386,281.80x = 79,341,161,502.78
  5. Step 5: Solve for x
    x = 79,341,161,502.78/386,281.80
  6. Step 6: Final answer
    x = 205,397.10

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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.