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Finding the Fourth Proportional to 389,713.80, 584,570.70 and 256,671.30

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Solution

The fourth proportional to 389,713.80, 584,570.70 and 256,671.30 is: 385,006.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,713.80 : 584,570.70 = 256,671.30 : x
  2. Step 2: Convert to fraction form
    389,713.80/584,570.70 = 256,671.30/x
  3. Step 3: Cross multiply
    389,713.80x = 584,570.70 × 256,671.30
  4. Step 4: Simplify right side
    389,713.80x = 150,042,521,510.91
  5. Step 5: Solve for x
    x = 150,042,521,510.91/389,713.80
  6. Step 6: Final answer
    x = 385,006.95

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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.