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Finding the Fourth Proportional to 666.53, 999.79 and 358.53

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Solution

The fourth proportional to 666.53, 999.79 and 358.53 is: 537.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.53 : 999.79 = 358.53 : x
  2. Step 2: Convert to fraction form
    666.53/999.79 = 358.53/x
  3. Step 3: Cross multiply
    666.53x = 999.79 × 358.53
  4. Step 4: Simplify right side
    666.53x = 358,455.16
  5. Step 5: Solve for x
    x = 358,455.16/666.53
  6. Step 6: Final answer
    x = 537.79

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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.