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Finding the Fourth Proportional to 721,887.12, 996,192.15 and 399,590.28

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Solution

The fourth proportional to 721,887.12, 996,192.15 and 399,590.28 is: 551,427.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,887.12 : 996,192.15 = 399,590.28 : x
  2. Step 2: Convert to fraction form
    721,887.12/996,192.15 = 399,590.28/x
  3. Step 3: Cross multiply
    721,887.12x = 996,192.15 × 399,590.28
  4. Step 4: Simplify right side
    721,887.12x = 398,068,700,152.30
  5. Step 5: Solve for x
    x = 398,068,700,152.30/721,887.12
  6. Step 6: Final answer
    x = 551,427.90

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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.