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Finding the Fourth Proportional to 56.48, 84.74 and 45.18

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Solution

The fourth proportional to 56.48, 84.74 and 45.18 is: 67.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.48 : 84.74 = 45.18 : x
  2. Step 2: Convert to fraction form
    56.48/84.74 = 45.18/x
  3. Step 3: Cross multiply
    56.48x = 84.74 × 45.18
  4. Step 4: Simplify right side
    56.48x = 3,828.33
  5. Step 5: Solve for x
    x = 3,828.33/56.48
  6. Step 6: Final answer
    x = 67.79

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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.