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Finding the Fourth Proportional to 45.20, 68.14 and 42.58

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Solution

The fourth proportional to 45.20, 68.14 and 42.58 is: 64.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.20 : 68.14 = 42.58 : x
  2. Step 2: Convert to fraction form
    45.20/68.14 = 42.58/x
  3. Step 3: Cross multiply
    45.20x = 68.14 × 42.58
  4. Step 4: Simplify right side
    45.20x = 2,901.40
  5. Step 5: Solve for x
    x = 2,901.40/45.20
  6. Step 6: Final answer
    x = 64.19

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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.