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Finding the Fourth Proportional to 3,388.70, 5,079.15 and 1,307.78

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Solution

The fourth proportional to 3,388.70, 5,079.15 and 1,307.78 is: 1,960.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,388.70 : 5,079.15 = 1,307.78 : x
  2. Step 2: Convert to fraction form
    3,388.70/5,079.15 = 1,307.78/x
  3. Step 3: Cross multiply
    3,388.70x = 5,079.15 × 1,307.78
  4. Step 4: Simplify right side
    3,388.70x = 6,642,423.48
  5. Step 5: Solve for x
    x = 6,642,423.48/3,388.70
  6. Step 6: Final answer
    x = 1,960.17

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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.