Home / 1,278.89-1,908.36-1,140.99

Finding the Fourth Proportional to 1,278.89, 1,908.36 and 1,140.99

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Solution

The fourth proportional to 1,278.89, 1,908.36 and 1,140.99 is: 1,702.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.89 : 1,908.36 = 1,140.99 : x
  2. Step 2: Convert to fraction form
    1,278.89/1,908.36 = 1,140.99/x
  3. Step 3: Cross multiply
    1,278.89x = 1,908.36 × 1,140.99
  4. Step 4: Simplify right side
    1,278.89x = 2,177,412.52
  5. Step 5: Solve for x
    x = 2,177,412.52/1,278.89
  6. Step 6: Final answer
    x = 1,702.58

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.