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Finding the Fourth Proportional to 56.16, 84.60 and 42

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Solution

The fourth proportional to 56.16, 84.60 and 42 is: 63.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.16 : 84.60 = 42 : x
  2. Step 2: Convert to fraction form
    56.16/84.60 = 42/x
  3. Step 3: Cross multiply
    56.16x = 84.60 × 42
  4. Step 4: Simplify right side
    56.16x = 3,553.20
  5. Step 5: Solve for x
    x = 3,553.20/56.16
  6. Step 6: Final answer
    x = 63.27

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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.