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Finding the Fourth Proportional to 1,315, 1,814.79 and 725.55

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Solution

The fourth proportional to 1,315, 1,814.79 and 725.55 is: 1,001.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315 : 1,814.79 = 725.55 : x
  2. Step 2: Convert to fraction form
    1,315/1,814.79 = 725.55/x
  3. Step 3: Cross multiply
    1,315x = 1,814.79 × 725.55
  4. Step 4: Simplify right side
    1,315x = 1,316,720.88
  5. Step 5: Solve for x
    x = 1,316,720.88/1,315
  6. Step 6: Final answer
    x = 1,001.31

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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.