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Finding the Fourth Proportional to 718,042.64, 990,885.84 and 391,358.48

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Solution

The fourth proportional to 718,042.64, 990,885.84 and 391,358.48 is: 540,067.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,042.64 : 990,885.84 = 391,358.48 : x
  2. Step 2: Convert to fraction form
    718,042.64/990,885.84 = 391,358.48/x
  3. Step 3: Cross multiply
    718,042.64x = 990,885.84 × 391,358.48
  4. Step 4: Simplify right side
    718,042.64x = 387,791,576,195.92
  5. Step 5: Solve for x
    x = 387,791,576,195.92/718,042.64
  6. Step 6: Final answer
    x = 540,067.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.