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Finding the Fourth Proportional to 639,838.30, 960,088.65 and 261,036.70

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Solution

The fourth proportional to 639,838.30, 960,088.65 and 261,036.70 is: 391,690.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,838.30 : 960,088.65 = 261,036.70 : x
  2. Step 2: Convert to fraction form
    639,838.30/960,088.65 = 261,036.70/x
  3. Step 3: Cross multiply
    639,838.30x = 960,088.65 × 261,036.70
  4. Step 4: Simplify right side
    639,838.30x = 250,618,372,903.46
  5. Step 5: Solve for x
    x = 250,618,372,903.46/639,838.30
  6. Step 6: Final answer
    x = 391,690.17

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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.