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Finding the Fourth Proportional to 720,622.32, 994,458.48 and 398,332.56

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Solution

The fourth proportional to 720,622.32, 994,458.48 and 398,332.56 is: 549,698.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,622.32 : 994,458.48 = 398,332.56 : x
  2. Step 2: Convert to fraction form
    720,622.32/994,458.48 = 398,332.56/x
  3. Step 3: Cross multiply
    720,622.32x = 994,458.48 × 398,332.56
  4. Step 4: Simplify right side
    720,622.32x = 396,125,192,152.11
  5. Step 5: Solve for x
    x = 396,125,192,152.11/720,622.32
  6. Step 6: Final answer
    x = 549,698.76

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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.