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Finding the Fourth Proportional to 718,402.16, 991,393.22 and 396,117.34

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Solution

The fourth proportional to 718,402.16, 991,393.22 and 396,117.34 is: 546,640.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,402.16 : 991,393.22 = 396,117.34 : x
  2. Step 2: Convert to fraction form
    718,402.16/991,393.22 = 396,117.34/x
  3. Step 3: Cross multiply
    718,402.16x = 991,393.22 × 396,117.34
  4. Step 4: Simplify right side
    718,402.16x = 392,708,043,712.25
  5. Step 5: Solve for x
    x = 392,708,043,712.25/718,402.16
  6. Step 6: Final answer
    x = 546,640.95

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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.