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Finding the Fourth Proportional to 104.87, 157.03 and 85.53

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Solution

The fourth proportional to 104.87, 157.03 and 85.53 is: 128.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.87 : 157.03 = 85.53 : x
  2. Step 2: Convert to fraction form
    104.87/157.03 = 85.53/x
  3. Step 3: Cross multiply
    104.87x = 157.03 × 85.53
  4. Step 4: Simplify right side
    104.87x = 13,430.78
  5. Step 5: Solve for x
    x = 13,430.78/104.87
  6. Step 6: Final answer
    x = 128.07

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.