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Finding the Fourth Proportional to 113.02, 168.70 and 103.40

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Solution

The fourth proportional to 113.02, 168.70 and 103.40 is: 154.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.02 : 168.70 = 103.40 : x
  2. Step 2: Convert to fraction form
    113.02/168.70 = 103.40/x
  3. Step 3: Cross multiply
    113.02x = 168.70 × 103.40
  4. Step 4: Simplify right side
    113.02x = 17,443.58
  5. Step 5: Solve for x
    x = 17,443.58/113.02
  6. Step 6: Final answer
    x = 154.34

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.