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Finding the Fourth Proportional to 61.36, 84.60 and 56.20

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Solution

The fourth proportional to 61.36, 84.60 and 56.20 is: 77.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.36 : 84.60 = 56.20 : x
  2. Step 2: Convert to fraction form
    61.36/84.60 = 56.20/x
  3. Step 3: Cross multiply
    61.36x = 84.60 × 56.20
  4. Step 4: Simplify right side
    61.36x = 4,754.52
  5. Step 5: Solve for x
    x = 4,754.52/61.36
  6. Step 6: Final answer
    x = 77.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.