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Finding the Fourth Proportional to 1,315.80, 1,815.80 and 726.34

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Solution

The fourth proportional to 1,315.80, 1,815.80 and 726.34 is: 1,002.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.80 : 1,815.80 = 726.34 : x
  2. Step 2: Convert to fraction form
    1,315.80/1,815.80 = 726.34/x
  3. Step 3: Cross multiply
    1,315.80x = 1,815.80 × 726.34
  4. Step 4: Simplify right side
    1,315.80x = 1,318,888.17
  5. Step 5: Solve for x
    x = 1,318,888.17/1,315.80
  6. Step 6: Final answer
    x = 1,002.35

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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.