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Finding the Fourth Proportional to 1,253.20, 1,880.20 and 387.76

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Solution

The fourth proportional to 1,253.20, 1,880.20 and 387.76 is: 581.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,253.20 : 1,880.20 = 387.76 : x
  2. Step 2: Convert to fraction form
    1,253.20/1,880.20 = 387.76/x
  3. Step 3: Cross multiply
    1,253.20x = 1,880.20 × 387.76
  4. Step 4: Simplify right side
    1,253.20x = 729,066.35
  5. Step 5: Solve for x
    x = 729,066.35/1,253.20
  6. Step 6: Final answer
    x = 581.76

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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.