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Finding the Fourth Proportional to 491,438.68, 678,394.61 and 330,387.13

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Solution

The fourth proportional to 491,438.68, 678,394.61 and 330,387.13 is: 456,074.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    491,438.68 : 678,394.61 = 330,387.13 : x
  2. Step 2: Convert to fraction form
    491,438.68/678,394.61 = 330,387.13/x
  3. Step 3: Cross multiply
    491,438.68x = 678,394.61 × 330,387.13
  4. Step 4: Simplify right side
    491,438.68x = 224,132,845,639.36
  5. Step 5: Solve for x
    x = 224,132,845,639.36/491,438.68
  6. Step 6: Final answer
    x = 456,074.90

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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.