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Finding the Fourth Proportional to 3,338.78, 5,008.13 and 1,390.53

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Solution

The fourth proportional to 3,338.78, 5,008.13 and 1,390.53 is: 2,085.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,338.78 : 5,008.13 = 1,390.53 : x
  2. Step 2: Convert to fraction form
    3,338.78/5,008.13 = 1,390.53/x
  3. Step 3: Cross multiply
    3,338.78x = 5,008.13 × 1,390.53
  4. Step 4: Simplify right side
    3,338.78x = 6,963,955.01
  5. Step 5: Solve for x
    x = 6,963,955.01/3,338.78
  6. Step 6: Final answer
    x = 2,085.78

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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.