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Finding the Fourth Proportional to 152.56, 210.30 and 129.16

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Solution

The fourth proportional to 152.56, 210.30 and 129.16 is: 178.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.56 : 210.30 = 129.16 : x
  2. Step 2: Convert to fraction form
    152.56/210.30 = 129.16/x
  3. Step 3: Cross multiply
    152.56x = 210.30 × 129.16
  4. Step 4: Simplify right side
    152.56x = 27,162.35
  5. Step 5: Solve for x
    x = 27,162.35/152.56
  6. Step 6: Final answer
    x = 178.04

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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.