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Finding the Fourth Proportional to 1,583.46, 2,375.19 and 429.21

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Solution

The fourth proportional to 1,583.46, 2,375.19 and 429.21 is: 643.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,583.46 : 2,375.19 = 429.21 : x
  2. Step 2: Convert to fraction form
    1,583.46/2,375.19 = 429.21/x
  3. Step 3: Cross multiply
    1,583.46x = 2,375.19 × 429.21
  4. Step 4: Simplify right side
    1,583.46x = 1,019,455.30
  5. Step 5: Solve for x
    x = 1,019,455.30/1,583.46
  6. Step 6: Final answer
    x = 643.82

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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.