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Finding the Fourth Proportional to 90.40, 124.72 and 53.54

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Solution

The fourth proportional to 90.40, 124.72 and 53.54 is: 73.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.40 : 124.72 = 53.54 : x
  2. Step 2: Convert to fraction form
    90.40/124.72 = 53.54/x
  3. Step 3: Cross multiply
    90.40x = 124.72 × 53.54
  4. Step 4: Simplify right side
    90.40x = 6,677.51
  5. Step 5: Solve for x
    x = 6,677.51/90.40
  6. Step 6: Final answer
    x = 73.87

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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.