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Finding the Fourth Proportional to 1,583.47, 2,375.20 and 429.31

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Solution

The fourth proportional to 1,583.47, 2,375.20 and 429.31 is: 643.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,583.47 : 2,375.20 = 429.31 : x
  2. Step 2: Convert to fraction form
    1,583.47/2,375.20 = 429.31/x
  3. Step 3: Cross multiply
    1,583.47x = 2,375.20 × 429.31
  4. Step 4: Simplify right side
    1,583.47x = 1,019,685.24
  5. Step 5: Solve for x
    x = 1,019,685.24/1,583.47
  6. Step 6: Final answer
    x = 643.96

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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.