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Finding the Fourth Proportional to 1,393.74, 1,924.07 and 1,078.29

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Solution

The fourth proportional to 1,393.74, 1,924.07 and 1,078.29 is: 1,488.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.74 : 1,924.07 = 1,078.29 : x
  2. Step 2: Convert to fraction form
    1,393.74/1,924.07 = 1,078.29/x
  3. Step 3: Cross multiply
    1,393.74x = 1,924.07 × 1,078.29
  4. Step 4: Simplify right side
    1,393.74x = 2,074,700.05
  5. Step 5: Solve for x
    x = 2,074,700.05/1,393.74
  6. Step 6: Final answer
    x = 1,488.58

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1.5x scale

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.