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Finding the Fourth Proportional to 401,838.80, 603,449.40 and 389,397.20

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Solution

The fourth proportional to 401,838.80, 603,449.40 and 389,397.20 is: 584,765.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    401,838.80 : 603,449.40 = 389,397.20 : x
  2. Step 2: Convert to fraction form
    401,838.80/603,449.40 = 389,397.20/x
  3. Step 3: Cross multiply
    401,838.80x = 603,449.40 × 389,397.20
  4. Step 4: Simplify right side
    401,838.80x = 234,981,506,701.68
  5. Step 5: Solve for x
    x = 234,981,506,701.68/401,838.80
  6. Step 6: Final answer
    x = 584,765.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.