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Finding the Fourth Proportional to 60.72, 90.74 and 56.06

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Solution

The fourth proportional to 60.72, 90.74 and 56.06 is: 83.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.72 : 90.74 = 56.06 : x
  2. Step 2: Convert to fraction form
    60.72/90.74 = 56.06/x
  3. Step 3: Cross multiply
    60.72x = 90.74 × 56.06
  4. Step 4: Simplify right side
    60.72x = 5,086.88
  5. Step 5: Solve for x
    x = 5,086.88/60.72
  6. Step 6: Final answer
    x = 83.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.