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Finding the Fourth Proportional to 431,648.80, 647,473.20 and 265,530.40

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Solution

The fourth proportional to 431,648.80, 647,473.20 and 265,530.40 is: 398,295.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,648.80 : 647,473.20 = 265,530.40 : x
  2. Step 2: Convert to fraction form
    431,648.80/647,473.20 = 265,530.40/x
  3. Step 3: Cross multiply
    431,648.80x = 647,473.20 × 265,530.40
  4. Step 4: Simplify right side
    431,648.80x = 171,923,817,785.28
  5. Step 5: Solve for x
    x = 171,923,817,785.28/431,648.80
  6. Step 6: Final answer
    x = 398,295.60

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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.