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Finding the Fourth Proportional to 57.99, 87.30 and 45.22

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Solution

The fourth proportional to 57.99, 87.30 and 45.22 is: 68.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.99 : 87.30 = 45.22 : x
  2. Step 2: Convert to fraction form
    57.99/87.30 = 45.22/x
  3. Step 3: Cross multiply
    57.99x = 87.30 × 45.22
  4. Step 4: Simplify right side
    57.99x = 3,947.71
  5. Step 5: Solve for x
    x = 3,947.71/57.99
  6. Step 6: Final answer
    x = 68.08

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.