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Finding the Fourth Proportional to 718,021.97, 990,857.46 and 391,337.92

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Solution

The fourth proportional to 718,021.97, 990,857.46 and 391,337.92 is: 540,039.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,021.97 : 990,857.46 = 391,337.92 : x
  2. Step 2: Convert to fraction form
    718,021.97/990,857.46 = 391,337.92/x
  3. Step 3: Cross multiply
    718,021.97x = 990,857.46 × 391,337.92
  4. Step 4: Simplify right side
    718,021.97x = 387,760,097,412.88
  5. Step 5: Solve for x
    x = 387,760,097,412.88/718,021.97
  6. Step 6: Final answer
    x = 540,039.32

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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.