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Finding the Fourth Proportional to 90.19, 124.50 and 57.45

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Solution

The fourth proportional to 90.19, 124.50 and 57.45 is: 79.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.19 : 124.50 = 57.45 : x
  2. Step 2: Convert to fraction form
    90.19/124.50 = 57.45/x
  3. Step 3: Cross multiply
    90.19x = 124.50 × 57.45
  4. Step 4: Simplify right side
    90.19x = 7,152.53
  5. Step 5: Solve for x
    x = 7,152.53/90.19
  6. Step 6: Final answer
    x = 79.31

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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.