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Finding the Fourth Proportional to 718,357.21, 991,339.76 and 396,079.07

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Solution

The fourth proportional to 718,357.21, 991,339.76 and 396,079.07 is: 546,592.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,357.21 : 991,339.76 = 396,079.07 : x
  2. Step 2: Convert to fraction form
    718,357.21/991,339.76 = 396,079.07/x
  3. Step 3: Cross multiply
    718,357.21x = 991,339.76 × 396,079.07
  4. Step 4: Simplify right side
    718,357.21x = 392,648,926,228.32
  5. Step 5: Solve for x
    x = 392,648,926,228.32/718,357.21
  6. Step 6: Final answer
    x = 546,592.87

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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.