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Finding the Fourth Proportional to 57.55, 79.40 and 35.70

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Solution

The fourth proportional to 57.55, 79.40 and 35.70 is: 49.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.55 : 79.40 = 35.70 : x
  2. Step 2: Convert to fraction form
    57.55/79.40 = 35.70/x
  3. Step 3: Cross multiply
    57.55x = 79.40 × 35.70
  4. Step 4: Simplify right side
    57.55x = 2,834.58
  5. Step 5: Solve for x
    x = 2,834.58/57.55
  6. Step 6: Final answer
    x = 49.25

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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.