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Finding the Fourth Proportional to 1,315.57, 1,815.39 and 726.11

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Solution

The fourth proportional to 1,315.57, 1,815.39 and 726.11 is: 1,001.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.57 : 1,815.39 = 726.11 : x
  2. Step 2: Convert to fraction form
    1,315.57/1,815.39 = 726.11/x
  3. Step 3: Cross multiply
    1,315.57x = 1,815.39 × 726.11
  4. Step 4: Simplify right side
    1,315.57x = 1,318,178.73
  5. Step 5: Solve for x
    x = 1,318,178.73/1,315.57
  6. Step 6: Final answer
    x = 1,001.99

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1.5x scale

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.