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Finding the Fourth Proportional to 438.46, 657.52 and 328.70

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Solution

The fourth proportional to 438.46, 657.52 and 328.70 is: 492.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.46 : 657.52 = 328.70 : x
  2. Step 2: Convert to fraction form
    438.46/657.52 = 328.70/x
  3. Step 3: Cross multiply
    438.46x = 657.52 × 328.70
  4. Step 4: Simplify right side
    438.46x = 216,126.82
  5. Step 5: Solve for x
    x = 216,126.82/438.46
  6. Step 6: Final answer
    x = 492.92

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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.