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Finding the Fourth Proportional to 718,019.84, 990,854.53 and 391,335.80

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Solution

The fourth proportional to 718,019.84, 990,854.53 and 391,335.80 is: 540,036.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,019.84 : 990,854.53 = 391,335.80 : x
  2. Step 2: Convert to fraction form
    718,019.84/990,854.53 = 391,335.80/x
  3. Step 3: Cross multiply
    718,019.84x = 990,854.53 × 391,335.80
  4. Step 4: Simplify right side
    718,019.84x = 387,756,844,248.56
  5. Step 5: Solve for x
    x = 387,756,844,248.56/718,019.84
  6. Step 6: Final answer
    x = 540,036.39

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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.