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Finding the Fourth Proportional to 1,251.68, 1,878.10 and 666.53

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Solution

The fourth proportional to 1,251.68, 1,878.10 and 666.53 is: 1,000.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.68 : 1,878.10 = 666.53 : x
  2. Step 2: Convert to fraction form
    1,251.68/1,878.10 = 666.53/x
  3. Step 3: Cross multiply
    1,251.68x = 1,878.10 × 666.53
  4. Step 4: Simplify right side
    1,251.68x = 1,251,809.99
  5. Step 5: Solve for x
    x = 1,251,809.99/1,251.68
  6. Step 6: Final answer
    x = 1,000.10

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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.