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Finding the Fourth Proportional to 35.42, 48.79 and 25.70

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Solution

The fourth proportional to 35.42, 48.79 and 25.70 is: 35.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    35.42 : 48.79 = 25.70 : x
  2. Step 2: Convert to fraction form
    35.42/48.79 = 25.70/x
  3. Step 3: Cross multiply
    35.42x = 48.79 × 25.70
  4. Step 4: Simplify right side
    35.42x = 1,253.90
  5. Step 5: Solve for x
    x = 1,253.90/35.42
  6. Step 6: Final answer
    x = 35.40

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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.