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Finding the Fourth Proportional to 152.74, 210.72 and 129.34

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Solution

The fourth proportional to 152.74, 210.72 and 129.34 is: 178.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.74 : 210.72 = 129.34 : x
  2. Step 2: Convert to fraction form
    152.74/210.72 = 129.34/x
  3. Step 3: Cross multiply
    152.74x = 210.72 × 129.34
  4. Step 4: Simplify right side
    152.74x = 27,254.52
  5. Step 5: Solve for x
    x = 27,254.52/152.74
  6. Step 6: Final answer
    x = 178.44

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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.