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Finding the Fourth Proportional to 807.03, 1,112.67 and 687.69

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Solution

The fourth proportional to 807.03, 1,112.67 and 687.69 is: 948.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.03 : 1,112.67 = 687.69 : x
  2. Step 2: Convert to fraction form
    807.03/1,112.67 = 687.69/x
  3. Step 3: Cross multiply
    807.03x = 1,112.67 × 687.69
  4. Step 4: Simplify right side
    807.03x = 765,172.03
  5. Step 5: Solve for x
    x = 765,172.03/807.03
  6. Step 6: Final answer
    x = 948.13

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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.