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Finding the Fourth Proportional to 1,314.90, 1,814.65 and 755.55

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Solution

The fourth proportional to 1,314.90, 1,814.65 and 755.55 is: 1,042.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,314.90 : 1,814.65 = 755.55 : x
  2. Step 2: Convert to fraction form
    1,314.90/1,814.65 = 755.55/x
  3. Step 3: Cross multiply
    1,314.90x = 1,814.65 × 755.55
  4. Step 4: Simplify right side
    1,314.90x = 1,371,058.81
  5. Step 5: Solve for x
    x = 1,371,058.81/1,314.90
  6. Step 6: Final answer
    x = 1,042.71

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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.