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Finding the Fourth Proportional to 721,921.52, 996,239.64 and 399,624.80

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Solution

The fourth proportional to 721,921.52, 996,239.64 and 399,624.80 is: 551,475.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,921.52 : 996,239.64 = 399,624.80 : x
  2. Step 2: Convert to fraction form
    721,921.52/996,239.64 = 399,624.80/x
  3. Step 3: Cross multiply
    721,921.52x = 996,239.64 × 399,624.80
  4. Step 4: Simplify right side
    721,921.52x = 398,122,066,887.07
  5. Step 5: Solve for x
    x = 398,122,066,887.07/721,921.52
  6. Step 6: Final answer
    x = 551,475.55

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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.