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Finding the Fourth Proportional to 147.72, 203.79 and 85.53

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Solution

The fourth proportional to 147.72, 203.79 and 85.53 is: 117.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.72 : 203.79 = 85.53 : x
  2. Step 2: Convert to fraction form
    147.72/203.79 = 85.53/x
  3. Step 3: Cross multiply
    147.72x = 203.79 × 85.53
  4. Step 4: Simplify right side
    147.72x = 17,430.16
  5. Step 5: Solve for x
    x = 17,430.16/147.72
  6. Step 6: Final answer
    x = 117.99

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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.