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Finding the Fourth Proportional to 143.60, 215.40 and 89.42

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Solution

The fourth proportional to 143.60, 215.40 and 89.42 is: 134.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.60 : 215.40 = 89.42 : x
  2. Step 2: Convert to fraction form
    143.60/215.40 = 89.42/x
  3. Step 3: Cross multiply
    143.60x = 215.40 × 89.42
  4. Step 4: Simplify right side
    143.60x = 19,261.07
  5. Step 5: Solve for x
    x = 19,261.07/143.60
  6. Step 6: Final answer
    x = 134.13

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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.