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Finding the Fourth Proportional to 1,315.40, 1,815.03 and 755.74

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Solution

The fourth proportional to 1,315.40, 1,815.03 and 755.74 is: 1,042.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.40 : 1,815.03 = 755.74 : x
  2. Step 2: Convert to fraction form
    1,315.40/1,815.03 = 755.74/x
  3. Step 3: Cross multiply
    1,315.40x = 1,815.03 × 755.74
  4. Step 4: Simplify right side
    1,315.40x = 1,371,690.77
  5. Step 5: Solve for x
    x = 1,371,690.77/1,315.40
  6. Step 6: Final answer
    x = 1,042.79

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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.