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Finding the Fourth Proportional to 60.86, 90.71 and 60.39

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Solution

The fourth proportional to 60.86, 90.71 and 60.39 is: 90.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.86 : 90.71 = 60.39 : x
  2. Step 2: Convert to fraction form
    60.86/90.71 = 60.39/x
  3. Step 3: Cross multiply
    60.86x = 90.71 × 60.39
  4. Step 4: Simplify right side
    60.86x = 5,478.13
  5. Step 5: Solve for x
    x = 5,478.13/60.86
  6. Step 6: Final answer
    x = 90.01

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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.