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Finding the Fourth Proportional to 143.81, 215.53 and 52.40

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Solution

The fourth proportional to 143.81, 215.53 and 52.40 is: 78.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.81 : 215.53 = 52.40 : x
  2. Step 2: Convert to fraction form
    143.81/215.53 = 52.40/x
  3. Step 3: Cross multiply
    143.81x = 215.53 × 52.40
  4. Step 4: Simplify right side
    143.81x = 11,292.97
  5. Step 5: Solve for x
    x = 11,292.97/143.81
  6. Step 6: Final answer
    x = 78.53

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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.