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Finding the Fourth Proportional to 88.30, 121.90 and 57.26

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Solution

The fourth proportional to 88.30, 121.90 and 57.26 is: 79.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.30 : 121.90 = 57.26 : x
  2. Step 2: Convert to fraction form
    88.30/121.90 = 57.26/x
  3. Step 3: Cross multiply
    88.30x = 121.90 × 57.26
  4. Step 4: Simplify right side
    88.30x = 6,979.99
  5. Step 5: Solve for x
    x = 6,979.99/88.30
  6. Step 6: Final answer
    x = 79.05

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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.