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Finding the Fourth Proportional to 45.17, 68.12 and 42.65

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Solution

The fourth proportional to 45.17, 68.12 and 42.65 is: 64.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.17 : 68.12 = 42.65 : x
  2. Step 2: Convert to fraction form
    45.17/68.12 = 42.65/x
  3. Step 3: Cross multiply
    45.17x = 68.12 × 42.65
  4. Step 4: Simplify right side
    45.17x = 2,904.76
  5. Step 5: Solve for x
    x = 2,904.76/45.17
  6. Step 6: Final answer
    x = 64.31

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.