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Finding the Fourth Proportional to 90.41, 124.58 and 87.77

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Solution

The fourth proportional to 90.41, 124.58 and 87.77 is: 120.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.41 : 124.58 = 87.77 : x
  2. Step 2: Convert to fraction form
    90.41/124.58 = 87.77/x
  3. Step 3: Cross multiply
    90.41x = 124.58 × 87.77
  4. Step 4: Simplify right side
    90.41x = 10,933.32
  5. Step 5: Solve for x
    x = 10,933.32/90.41
  6. Step 6: Final answer
    x = 120.94

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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.