Home / 1,279.25-1,919.05-457.35

Finding the Fourth Proportional to 1,279.25, 1,919.05 and 457.35

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Solution

The fourth proportional to 1,279.25, 1,919.05 and 457.35 is: 686.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.25 : 1,919.05 = 457.35 : x
  2. Step 2: Convert to fraction form
    1,279.25/1,919.05 = 457.35/x
  3. Step 3: Cross multiply
    1,279.25x = 1,919.05 × 457.35
  4. Step 4: Simplify right side
    1,279.25x = 877,677.52
  5. Step 5: Solve for x
    x = 877,677.52/1,279.25
  6. Step 6: Final answer
    x = 686.09

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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.