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Finding the Fourth Proportional to 1,315.16, 1,814.78 and 725.58

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Solution

The fourth proportional to 1,315.16, 1,814.78 and 725.58 is: 1,001.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.16 : 1,814.78 = 725.58 : x
  2. Step 2: Convert to fraction form
    1,315.16/1,814.78 = 725.58/x
  3. Step 3: Cross multiply
    1,315.16x = 1,814.78 × 725.58
  4. Step 4: Simplify right side
    1,315.16x = 1,316,768.07
  5. Step 5: Solve for x
    x = 1,316,768.07/1,315.16
  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.