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Finding the Fourth Proportional to 639,426.60, 959,139.90 and 448,655.40

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Solution

The fourth proportional to 639,426.60, 959,139.90 and 448,655.40 is: 672,983.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,426.60 : 959,139.90 = 448,655.40 : x
  2. Step 2: Convert to fraction form
    639,426.60/959,139.90 = 448,655.40/x
  3. Step 3: Cross multiply
    639,426.60x = 959,139.90 × 448,655.40
  4. Step 4: Simplify right side
    639,426.60x = 430,323,295,490.46
  5. Step 5: Solve for x
    x = 430,323,295,490.46/639,426.60
  6. Step 6: Final answer
    x = 672,983.10

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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.