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Finding the Fourth Proportional to 660.27, 991.46 and 429.72

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Solution

The fourth proportional to 660.27, 991.46 and 429.72 is: 645.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.27 : 991.46 = 429.72 : x
  2. Step 2: Convert to fraction form
    660.27/991.46 = 429.72/x
  3. Step 3: Cross multiply
    660.27x = 991.46 × 429.72
  4. Step 4: Simplify right side
    660.27x = 426,050.19
  5. Step 5: Solve for x
    x = 426,050.19/660.27
  6. Step 6: Final answer
    x = 645.27

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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.