Home / 1,207.14-1,667.61-815.88

Finding the Fourth Proportional to 1,207.14, 1,667.61 and 815.88

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Solution

The fourth proportional to 1,207.14, 1,667.61 and 815.88 is: 1,127.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.14 : 1,667.61 = 815.88 : x
  2. Step 2: Convert to fraction form
    1,207.14/1,667.61 = 815.88/x
  3. Step 3: Cross multiply
    1,207.14x = 1,667.61 × 815.88
  4. Step 4: Simplify right side
    1,207.14x = 1,360,569.65
  5. Step 5: Solve for x
    x = 1,360,569.65/1,207.14
  6. Step 6: Final answer
    x = 1,127.10

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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.