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Finding the Fourth Proportional to 148.04, 203.68 and 128.31

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Solution

The fourth proportional to 148.04, 203.68 and 128.31 is: 176.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.04 : 203.68 = 128.31 : x
  2. Step 2: Convert to fraction form
    148.04/203.68 = 128.31/x
  3. Step 3: Cross multiply
    148.04x = 203.68 × 128.31
  4. Step 4: Simplify right side
    148.04x = 26,133.58
  5. Step 5: Solve for x
    x = 26,133.58/148.04
  6. Step 6: Final answer
    x = 176.53

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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.