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Finding the Fourth Proportional to 1,583.40, 2,375 and 487.68

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Solution

The fourth proportional to 1,583.40, 2,375 and 487.68 is: 731.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,583.40 : 2,375 = 487.68 : x
  2. Step 2: Convert to fraction form
    1,583.40/2,375 = 487.68/x
  3. Step 3: Cross multiply
    1,583.40x = 2,375 × 487.68
  4. Step 4: Simplify right side
    1,583.40x = 1,158,240
  5. Step 5: Solve for x
    x = 1,158,240/1,583.40
  6. Step 6: Final answer
    x = 731.49

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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.