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Finding the Fourth Proportional to 240.72, 360.84 and 78.36

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Solution

The fourth proportional to 240.72, 360.84 and 78.36 is: 117.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    240.72 : 360.84 = 78.36 : x
  2. Step 2: Convert to fraction form
    240.72/360.84 = 78.36/x
  3. Step 3: Cross multiply
    240.72x = 360.84 × 78.36
  4. Step 4: Simplify right side
    240.72x = 28,275.42
  5. Step 5: Solve for x
    x = 28,275.42/240.72
  6. Step 6: Final answer
    x = 117.46

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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.