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Finding the Fourth Proportional to 147.66, 203.79 and 89.45

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Solution

The fourth proportional to 147.66, 203.79 and 89.45 is: 123.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.66 : 203.79 = 89.45 : x
  2. Step 2: Convert to fraction form
    147.66/203.79 = 89.45/x
  3. Step 3: Cross multiply
    147.66x = 203.79 × 89.45
  4. Step 4: Simplify right side
    147.66x = 18,229.02
  5. Step 5: Solve for x
    x = 18,229.02/147.66
  6. Step 6: Final answer
    x = 123.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.