Home / 1,209.58-1,667.28-815.92

Finding the Fourth Proportional to 1,209.58, 1,667.28 and 815.92

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Solution

The fourth proportional to 1,209.58, 1,667.28 and 815.92 is: 1,124.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.58 : 1,667.28 = 815.92 : x
  2. Step 2: Convert to fraction form
    1,209.58/1,667.28 = 815.92/x
  3. Step 3: Cross multiply
    1,209.58x = 1,667.28 × 815.92
  4. Step 4: Simplify right side
    1,209.58x = 1,360,367.10
  5. Step 5: Solve for x
    x = 1,360,367.10/1,209.58
  6. Step 6: Final answer
    x = 1,124.66

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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.