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Finding the Fourth Proportional to 60.48, 83.20 and 51.12

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Solution

The fourth proportional to 60.48, 83.20 and 51.12 is: 70.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.48 : 83.20 = 51.12 : x
  2. Step 2: Convert to fraction form
    60.48/83.20 = 51.12/x
  3. Step 3: Cross multiply
    60.48x = 83.20 × 51.12
  4. Step 4: Simplify right side
    60.48x = 4,253.18
  5. Step 5: Solve for x
    x = 4,253.18/60.48
  6. Step 6: Final answer
    x = 70.32

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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.