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Finding the Fourth Proportional to 666.70, 1,000.20 and 320.02

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Solution

The fourth proportional to 666.70, 1,000.20 and 320.02 is: 480.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.70 : 1,000.20 = 320.02 : x
  2. Step 2: Convert to fraction form
    666.70/1,000.20 = 320.02/x
  3. Step 3: Cross multiply
    666.70x = 1,000.20 × 320.02
  4. Step 4: Simplify right side
    666.70x = 320,084.00
  5. Step 5: Solve for x
    x = 320,084.00/666.70
  6. Step 6: Final answer
    x = 480.10

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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.