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Finding the Fourth Proportional to 113.40, 170.10 and 78.67

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Solution

The fourth proportional to 113.40, 170.10 and 78.67 is: 118.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.40 : 170.10 = 78.67 : x
  2. Step 2: Convert to fraction form
    113.40/170.10 = 78.67/x
  3. Step 3: Cross multiply
    113.40x = 170.10 × 78.67
  4. Step 4: Simplify right side
    113.40x = 13,381.98
  5. Step 5: Solve for x
    x = 13,381.98/113.40
  6. Step 6: Final answer
    x = 118.01

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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.