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Finding the Fourth Proportional to 135.70, 187.50 and 111.40

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Solution

The fourth proportional to 135.70, 187.50 and 111.40 is: 153.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.70 : 187.50 = 111.40 : x
  2. Step 2: Convert to fraction form
    135.70/187.50 = 111.40/x
  3. Step 3: Cross multiply
    135.70x = 187.50 × 111.40
  4. Step 4: Simplify right side
    135.70x = 20,887.50
  5. Step 5: Solve for x
    x = 20,887.50/135.70
  6. Step 6: Final answer
    x = 153.92

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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.