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Finding the Fourth Proportional to 5,138.84, 7,706.64 and 1,440.78

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Solution

The fourth proportional to 5,138.84, 7,706.64 and 1,440.78 is: 2,160.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,138.84 : 7,706.64 = 1,440.78 : x
  2. Step 2: Convert to fraction form
    5,138.84/7,706.64 = 1,440.78/x
  3. Step 3: Cross multiply
    5,138.84x = 7,706.64 × 1,440.78
  4. Step 4: Simplify right side
    5,138.84x = 11,103,572.78
  5. Step 5: Solve for x
    x = 11,103,572.78/5,138.84
  6. Step 6: Final answer
    x = 2,160.72

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1.5x scale

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.