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Finding the Fourth Proportional to 90.30, 124.63 and 57.56

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Solution

The fourth proportional to 90.30, 124.63 and 57.56 is: 79.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.30 : 124.63 = 57.56 : x
  2. Step 2: Convert to fraction form
    90.30/124.63 = 57.56/x
  3. Step 3: Cross multiply
    90.30x = 124.63 × 57.56
  4. Step 4: Simplify right side
    90.30x = 7,173.70
  5. Step 5: Solve for x
    x = 7,173.70/90.30
  6. Step 6: Final answer
    x = 79.44

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.