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Finding the Fourth Proportional to 669.96, 1,005.21 and 237.15

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Solution

The fourth proportional to 669.96, 1,005.21 and 237.15 is: 355.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.96 : 1,005.21 = 237.15 : x
  2. Step 2: Convert to fraction form
    669.96/1,005.21 = 237.15/x
  3. Step 3: Cross multiply
    669.96x = 1,005.21 × 237.15
  4. Step 4: Simplify right side
    669.96x = 238,385.55
  5. Step 5: Solve for x
    x = 238,385.55/669.96
  6. Step 6: Final answer
    x = 355.82

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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.