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Finding the Fourth Proportional to 639,478.98, 958,385.47 and 259,956.38

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Solution

The fourth proportional to 639,478.98, 958,385.47 and 259,956.38 is: 389,595.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,478.98 : 958,385.47 = 259,956.38 : x
  2. Step 2: Convert to fraction form
    639,478.98/958,385.47 = 259,956.38/x
  3. Step 3: Cross multiply
    639,478.98x = 958,385.47 × 259,956.38
  4. Step 4: Simplify right side
    639,478.98x = 249,138,412,920.64
  5. Step 5: Solve for x
    x = 249,138,412,920.64/639,478.98
  6. Step 6: Final answer
    x = 389,595.94

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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.