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Finding the Fourth Proportional to 106.30, 159.40 and 45.40

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Solution

The fourth proportional to 106.30, 159.40 and 45.40 is: 68.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.30 : 159.40 = 45.40 : x
  2. Step 2: Convert to fraction form
    106.30/159.40 = 45.40/x
  3. Step 3: Cross multiply
    106.30x = 159.40 × 45.40
  4. Step 4: Simplify right side
    106.30x = 7,236.76
  5. Step 5: Solve for x
    x = 7,236.76/106.30
  6. Step 6: Final answer
    x = 68.08

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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.