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Finding the Fourth Proportional to 60.61, 90.14 and 56.80

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Solution

The fourth proportional to 60.61, 90.14 and 56.80 is: 84.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.61 : 90.14 = 56.80 : x
  2. Step 2: Convert to fraction form
    60.61/90.14 = 56.80/x
  3. Step 3: Cross multiply
    60.61x = 90.14 × 56.80
  4. Step 4: Simplify right side
    60.61x = 5,119.95
  5. Step 5: Solve for x
    x = 5,119.95/60.61
  6. Step 6: Final answer
    x = 84.47

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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.