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Finding the Fourth Proportional to 718,813.28, 991,959.54 and 396,543.44

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Solution

The fourth proportional to 718,813.28, 991,959.54 and 396,543.44 is: 547,228.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,813.28 : 991,959.54 = 396,543.44 : x
  2. Step 2: Convert to fraction form
    718,813.28/991,959.54 = 396,543.44/x
  3. Step 3: Cross multiply
    718,813.28x = 991,959.54 × 396,543.44
  4. Step 4: Simplify right side
    718,813.28x = 393,355,048,332.42
  5. Step 5: Solve for x
    x = 393,355,048,332.42/718,813.28
  6. Step 6: Final answer
    x = 547,228.41

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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.