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Finding the Fourth Proportional to 57.30, 85.77 and 40.08

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Solution

The fourth proportional to 57.30, 85.77 and 40.08 is: 59.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.30 : 85.77 = 40.08 : x
  2. Step 2: Convert to fraction form
    57.30/85.77 = 40.08/x
  3. Step 3: Cross multiply
    57.30x = 85.77 × 40.08
  4. Step 4: Simplify right side
    57.30x = 3,437.66
  5. Step 5: Solve for x
    x = 3,437.66/57.30
  6. Step 6: Final answer
    x = 59.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.