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Finding the Fourth Proportional to 113.90, 157.15 and 69.60

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Solution

The fourth proportional to 113.90, 157.15 and 69.60 is: 96.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.90 : 157.15 = 69.60 : x
  2. Step 2: Convert to fraction form
    113.90/157.15 = 69.60/x
  3. Step 3: Cross multiply
    113.90x = 157.15 × 69.60
  4. Step 4: Simplify right side
    113.90x = 10,937.47
  5. Step 5: Solve for x
    x = 10,937.47/113.90
  6. Step 6: Final answer
    x = 96.03

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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.