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Finding the Fourth Proportional to 240.60, 360.90 and 215.40

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Solution

The fourth proportional to 240.60, 360.90 and 215.40 is: 323.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    240.60 : 360.90 = 215.40 : x
  2. Step 2: Convert to fraction form
    240.60/360.90 = 215.40/x
  3. Step 3: Cross multiply
    240.60x = 360.90 × 215.40
  4. Step 4: Simplify right side
    240.60x = 77,737.86
  5. Step 5: Solve for x
    x = 77,737.86/240.60
  6. Step 6: Final answer
    x = 323.10

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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.