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Finding the Fourth Proportional to 90.76, 125.27 and 85.77

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Solution

The fourth proportional to 90.76, 125.27 and 85.77 is: 118.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.76 : 125.27 = 85.77 : x
  2. Step 2: Convert to fraction form
    90.76/125.27 = 85.77/x
  3. Step 3: Cross multiply
    90.76x = 125.27 × 85.77
  4. Step 4: Simplify right side
    90.76x = 10,744.41
  5. Step 5: Solve for x
    x = 10,744.41/90.76
  6. Step 6: Final answer
    x = 118.38

Related Problems

Find fourth proportional to 45.38, 62.64 and 42.89
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1.5x scale

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.