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Finding the Fourth Proportional to 648.55, 972.89 and 215.74

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Solution

The fourth proportional to 648.55, 972.89 and 215.74 is: 323.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.55 : 972.89 = 215.74 : x
  2. Step 2: Convert to fraction form
    648.55/972.89 = 215.74/x
  3. Step 3: Cross multiply
    648.55x = 972.89 × 215.74
  4. Step 4: Simplify right side
    648.55x = 209,885.35
  5. Step 5: Solve for x
    x = 209,885.35/648.55
  6. Step 6: Final answer
    x = 323.62

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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.