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Finding the Fourth Proportional to 1,315.69, 1,815.51 and 726.11

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Solution

The fourth proportional to 1,315.69, 1,815.51 and 726.11 is: 1,001.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.69 : 1,815.51 = 726.11 : x
  2. Step 2: Convert to fraction form
    1,315.69/1,815.51 = 726.11/x
  3. Step 3: Cross multiply
    1,315.69x = 1,815.51 × 726.11
  4. Step 4: Simplify right side
    1,315.69x = 1,318,270.63
  5. Step 5: Solve for x
    x = 1,318,270.63/1,315.69
  6. Step 6: Final answer
    x = 1,001.96

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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.