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Finding the Fourth Proportional to 718,495.60, 991,530.84 and 396,217.12

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Solution

The fourth proportional to 718,495.60, 991,530.84 and 396,217.12 is: 546,783.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,495.60 : 991,530.84 = 396,217.12 : x
  2. Step 2: Convert to fraction form
    718,495.60/991,530.84 = 396,217.12/x
  3. Step 3: Cross multiply
    718,495.60x = 991,530.84 × 396,217.12
  4. Step 4: Simplify right side
    718,495.60x = 392,861,493,815.98
  5. Step 5: Solve for x
    x = 392,861,493,815.98/718,495.60
  6. Step 6: Final answer
    x = 546,783.44

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Double scale
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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.