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Finding the Fourth Proportional to 152.29, 210.15 and 85.91

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Solution

The fourth proportional to 152.29, 210.15 and 85.91 is: 118.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.29 : 210.15 = 85.91 : x
  2. Step 2: Convert to fraction form
    152.29/210.15 = 85.91/x
  3. Step 3: Cross multiply
    152.29x = 210.15 × 85.91
  4. Step 4: Simplify right side
    152.29x = 18,053.56
  5. Step 5: Solve for x
    x = 18,053.56/152.29
  6. Step 6: Final answer
    x = 118.55

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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.