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Finding the Fourth Proportional to 52.45, 78.52 and 40.20

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Solution

The fourth proportional to 52.45, 78.52 and 40.20 is: 60.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.45 : 78.52 = 40.20 : x
  2. Step 2: Convert to fraction form
    52.45/78.52 = 40.20/x
  3. Step 3: Cross multiply
    52.45x = 78.52 × 40.20
  4. Step 4: Simplify right side
    52.45x = 3,156.18
  5. Step 5: Solve for x
    x = 3,156.18/52.45
  6. Step 6: Final answer
    x = 60.18

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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.