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Finding the Fourth Proportional to 147.61, 203.72 and 85.45

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Solution

The fourth proportional to 147.61, 203.72 and 85.45 is: 117.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.61 : 203.72 = 85.45 : x
  2. Step 2: Convert to fraction form
    147.61/203.72 = 85.45/x
  3. Step 3: Cross multiply
    147.61x = 203.72 × 85.45
  4. Step 4: Simplify right side
    147.61x = 17,407.58
  5. Step 5: Solve for x
    x = 17,407.58/147.61
  6. Step 6: Final answer
    x = 117.93

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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.