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Finding the Fourth Proportional to 1,235.29, 1,703.96 and 815.65

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Solution

The fourth proportional to 1,235.29, 1,703.96 and 815.65 is: 1,125.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,235.29 : 1,703.96 = 815.65 : x
  2. Step 2: Convert to fraction form
    1,235.29/1,703.96 = 815.65/x
  3. Step 3: Cross multiply
    1,235.29x = 1,703.96 × 815.65
  4. Step 4: Simplify right side
    1,235.29x = 1,389,834.97
  5. Step 5: Solve for x
    x = 1,389,834.97/1,235.29
  6. Step 6: Final answer
    x = 1,125.11

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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.