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Finding the Fourth Proportional to 666.68, 1,000.35 and 276.72

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Solution

The fourth proportional to 666.68, 1,000.35 and 276.72 is: 415.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.68 : 1,000.35 = 276.72 : x
  2. Step 2: Convert to fraction form
    666.68/1,000.35 = 276.72/x
  3. Step 3: Cross multiply
    666.68x = 1,000.35 × 276.72
  4. Step 4: Simplify right side
    666.68x = 276,813.10
  5. Step 5: Solve for x
    x = 276,813.10/666.68
  6. Step 6: Final answer
    x = 415.21

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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.