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Finding the Fourth Proportional to 639,702.61, 959,288.65 and 260,365.89

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Solution

The fourth proportional to 639,702.61, 959,288.65 and 260,365.89 is: 390,440.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,702.61 : 959,288.65 = 260,365.89 : x
  2. Step 2: Convert to fraction form
    639,702.61/959,288.65 = 260,365.89/x
  3. Step 3: Cross multiply
    639,702.61x = 959,288.65 × 260,365.89
  4. Step 4: Simplify right side
    639,702.61x = 249,766,043,124.15
  5. Step 5: Solve for x
    x = 249,766,043,124.15/639,702.61
  6. Step 6: Final answer
    x = 390,440.87

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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.