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Finding the Fourth Proportional to 666.94, 1,000.40 and 342.12

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Solution

The fourth proportional to 666.94, 1,000.40 and 342.12 is: 513.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.94 : 1,000.40 = 342.12 : x
  2. Step 2: Convert to fraction form
    666.94/1,000.40 = 342.12/x
  3. Step 3: Cross multiply
    666.94x = 1,000.40 × 342.12
  4. Step 4: Simplify right side
    666.94x = 342,256.85
  5. Step 5: Solve for x
    x = 342,256.85/666.94
  6. Step 6: Final answer
    x = 513.17

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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.