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Finding the Fourth Proportional to 143.75, 216.47 and 103.46

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Solution

The fourth proportional to 143.75, 216.47 and 103.46 is: 155.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.75 : 216.47 = 103.46 : x
  2. Step 2: Convert to fraction form
    143.75/216.47 = 103.46/x
  3. Step 3: Cross multiply
    143.75x = 216.47 × 103.46
  4. Step 4: Simplify right side
    143.75x = 22,395.16
  5. Step 5: Solve for x
    x = 22,395.16/143.75
  6. Step 6: Final answer
    x = 155.79

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.