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Finding the Fourth Proportional to 1,315.04, 1,814.56 and 725.60

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Solution

The fourth proportional to 1,315.04, 1,814.56 and 725.60 is: 1,001.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.04 : 1,814.56 = 725.60 : x
  2. Step 2: Convert to fraction form
    1,315.04/1,814.56 = 725.60/x
  3. Step 3: Cross multiply
    1,315.04x = 1,814.56 × 725.60
  4. Step 4: Simplify right side
    1,315.04x = 1,316,644.74
  5. Step 5: Solve for x
    x = 1,316,644.74/1,315.04
  6. Step 6: Final answer
    x = 1,001.22

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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.