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Finding the Fourth Proportional to 147.15, 203.18 and 128.93

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Solution

The fourth proportional to 147.15, 203.18 and 128.93 is: 178.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.15 : 203.18 = 128.93 : x
  2. Step 2: Convert to fraction form
    147.15/203.18 = 128.93/x
  3. Step 3: Cross multiply
    147.15x = 203.18 × 128.93
  4. Step 4: Simplify right side
    147.15x = 26,194.34
  5. Step 5: Solve for x
    x = 26,194.34/147.15
  6. Step 6: Final answer
    x = 178.01

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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.