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Finding the Fourth Proportional to 287,712.80, 431,569.20 and 147,744.80

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Solution

The fourth proportional to 287,712.80, 431,569.20 and 147,744.80 is: 221,617.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,712.80 : 431,569.20 = 147,744.80 : x
  2. Step 2: Convert to fraction form
    287,712.80/431,569.20 = 147,744.80/x
  3. Step 3: Cross multiply
    287,712.80x = 431,569.20 × 147,744.80
  4. Step 4: Simplify right side
    287,712.80x = 63,762,105,140.16
  5. Step 5: Solve for x
    x = 63,762,105,140.16/287,712.80
  6. Step 6: Final answer
    x = 221,617.20

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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.