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Finding the Fourth Proportional to 57.60, 79.50 and 39.18

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Solution

The fourth proportional to 57.60, 79.50 and 39.18 is: 54.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.60 : 79.50 = 39.18 : x
  2. Step 2: Convert to fraction form
    57.60/79.50 = 39.18/x
  3. Step 3: Cross multiply
    57.60x = 79.50 × 39.18
  4. Step 4: Simplify right side
    57.60x = 3,114.81
  5. Step 5: Solve for x
    x = 3,114.81/57.60
  6. Step 6: Final answer
    x = 54.08

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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.