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Finding the Fourth Proportional to 721,248.81, 995,311.05 and 398,958.63

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Solution

The fourth proportional to 721,248.81, 995,311.05 and 398,958.63 is: 550,556.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,248.81 : 995,311.05 = 398,958.63 : x
  2. Step 2: Convert to fraction form
    721,248.81/995,311.05 = 398,958.63/x
  3. Step 3: Cross multiply
    721,248.81x = 995,311.05 × 398,958.63
  4. Step 4: Simplify right side
    721,248.81x = 397,087,932,931.86
  5. Step 5: Solve for x
    x = 397,087,932,931.86/721,248.81
  6. Step 6: Final answer
    x = 550,556.10

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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.