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Finding the Fourth Proportional to 155.07, 213.99 and 85.13

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Solution

The fourth proportional to 155.07, 213.99 and 85.13 is: 117.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.07 : 213.99 = 85.13 : x
  2. Step 2: Convert to fraction form
    155.07/213.99 = 85.13/x
  3. Step 3: Cross multiply
    155.07x = 213.99 × 85.13
  4. Step 4: Simplify right side
    155.07x = 18,215.90
  5. Step 5: Solve for x
    x = 18,215.90/155.07
  6. Step 6: Final answer
    x = 117.47

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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.