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Finding the Fourth Proportional to 687.62, 1,036.26 and 619.22

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Solution

The fourth proportional to 687.62, 1,036.26 and 619.22 is: 933.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.62 : 1,036.26 = 619.22 : x
  2. Step 2: Convert to fraction form
    687.62/1,036.26 = 619.22/x
  3. Step 3: Cross multiply
    687.62x = 1,036.26 × 619.22
  4. Step 4: Simplify right side
    687.62x = 641,672.92
  5. Step 5: Solve for x
    x = 641,672.92/687.62
  6. Step 6: Final answer
    x = 933.18

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.