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Finding the Fourth Proportional to 152.54, 210.49 and 86.15

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Solution

The fourth proportional to 152.54, 210.49 and 86.15 is: 118.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.54 : 210.49 = 86.15 : x
  2. Step 2: Convert to fraction form
    152.54/210.49 = 86.15/x
  3. Step 3: Cross multiply
    152.54x = 210.49 × 86.15
  4. Step 4: Simplify right side
    152.54x = 18,133.71
  5. Step 5: Solve for x
    x = 18,133.71/152.54
  6. Step 6: Final answer
    x = 118.88

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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.