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Finding the Fourth Proportional to 113.40, 158.40 and 113.40

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Solution

The fourth proportional to 113.40, 158.40 and 113.40 is: 158.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.40 : 158.40 = 113.40 : x
  2. Step 2: Convert to fraction form
    113.40/158.40 = 113.40/x
  3. Step 3: Cross multiply
    113.40x = 158.40 × 113.40
  4. Step 4: Simplify right side
    113.40x = 17,962.56
  5. Step 5: Solve for x
    x = 17,962.56/113.40
  6. Step 6: Final answer
    x = 158.40

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.