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Finding the Fourth Proportional to 287,587.80, 431,381.70 and 147,619.80

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Solution

The fourth proportional to 287,587.80, 431,381.70 and 147,619.80 is: 221,429.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,587.80 : 431,381.70 = 147,619.80 : x
  2. Step 2: Convert to fraction form
    287,587.80/431,381.70 = 147,619.80/x
  3. Step 3: Cross multiply
    287,587.80x = 431,381.70 × 147,619.80
  4. Step 4: Simplify right side
    287,587.80x = 63,680,480,277.66
  5. Step 5: Solve for x
    x = 63,680,480,277.66/287,587.80
  6. Step 6: Final answer
    x = 221,429.70

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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.