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Finding the Fourth Proportional to 1,315.85, 1,815.80 and 726.26

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Solution

The fourth proportional to 1,315.85, 1,815.80 and 726.26 is: 1,002.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.85 : 1,815.80 = 726.26 : x
  2. Step 2: Convert to fraction form
    1,315.85/1,815.80 = 726.26/x
  3. Step 3: Cross multiply
    1,315.85x = 1,815.80 × 726.26
  4. Step 4: Simplify right side
    1,315.85x = 1,318,730.20
  5. Step 5: Solve for x
    x = 1,318,730.20/1,315.85
  6. Step 6: Final answer
    x = 1,002.19

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Double scale
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Similar ratio
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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.