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Finding the Fourth Proportional to 389,635.80, 584,307.90 and 136,818.60

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Solution

The fourth proportional to 389,635.80, 584,307.90 and 136,818.60 is: 205,176.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,635.80 : 584,307.90 = 136,818.60 : x
  2. Step 2: Convert to fraction form
    389,635.80/584,307.90 = 136,818.60/x
  3. Step 3: Cross multiply
    389,635.80x = 584,307.90 × 136,818.60
  4. Step 4: Simplify right side
    389,635.80x = 79,944,188,846.94
  5. Step 5: Solve for x
    x = 79,944,188,846.94/389,635.80
  6. Step 6: Final answer
    x = 205,176.70

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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.