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Finding the Fourth Proportional to 51.40, 70.75 and 49.69

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Solution

The fourth proportional to 51.40, 70.75 and 49.69 is: 68.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.40 : 70.75 = 49.69 : x
  2. Step 2: Convert to fraction form
    51.40/70.75 = 49.69/x
  3. Step 3: Cross multiply
    51.40x = 70.75 × 49.69
  4. Step 4: Simplify right side
    51.40x = 3,515.57
  5. Step 5: Solve for x
    x = 3,515.57/51.40
  6. Step 6: Final answer
    x = 68.40

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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.