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Finding the Fourth Proportional to 90.23, 124.53 and 70.79

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Solution

The fourth proportional to 90.23, 124.53 and 70.79 is: 97.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.23 : 124.53 = 70.79 : x
  2. Step 2: Convert to fraction form
    90.23/124.53 = 70.79/x
  3. Step 3: Cross multiply
    90.23x = 124.53 × 70.79
  4. Step 4: Simplify right side
    90.23x = 8,815.46
  5. Step 5: Solve for x
    x = 8,815.46/90.23
  6. Step 6: Final answer
    x = 97.70

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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.