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Finding the Fourth Proportional to 666.99, 1,000.89 and 423.18

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Solution

The fourth proportional to 666.99, 1,000.89 and 423.18 is: 635.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.99 : 1,000.89 = 423.18 : x
  2. Step 2: Convert to fraction form
    666.99/1,000.89 = 423.18/x
  3. Step 3: Cross multiply
    666.99x = 1,000.89 × 423.18
  4. Step 4: Simplify right side
    666.99x = 423,556.63
  5. Step 5: Solve for x
    x = 423,556.63/666.99
  6. Step 6: Final answer
    x = 635.03

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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.