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Finding the Fourth Proportional to 639,838.80, 960,089.40 and 261,037.20

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Solution

The fourth proportional to 639,838.80, 960,089.40 and 261,037.20 is: 391,690.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,838.80 : 960,089.40 = 261,037.20 : x
  2. Step 2: Convert to fraction form
    639,838.80/960,089.40 = 261,037.20/x
  3. Step 3: Cross multiply
    639,838.80x = 960,089.40 × 261,037.20
  4. Step 4: Simplify right side
    639,838.80x = 250,619,048,725.68
  5. Step 5: Solve for x
    x = 250,619,048,725.68/639,838.80
  6. Step 6: Final answer
    x = 391,690.92

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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.