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Finding the Fourth Proportional to 1,315.69, 1,815.66 and 726.25

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Solution

The fourth proportional to 1,315.69, 1,815.66 and 726.25 is: 1,002.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.69 : 1,815.66 = 726.25 : x
  2. Step 2: Convert to fraction form
    1,315.69/1,815.66 = 726.25/x
  3. Step 3: Cross multiply
    1,315.69x = 1,815.66 × 726.25
  4. Step 4: Simplify right side
    1,315.69x = 1,318,618.54
  5. Step 5: Solve for x
    x = 1,318,618.54/1,315.69
  6. Step 6: Final answer
    x = 1,002.22

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Half scale
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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.