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Finding the Fourth Proportional to 697.41, 1,038.22 and 687.69

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Solution

The fourth proportional to 697.41, 1,038.22 and 687.69 is: 1,023.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.41 : 1,038.22 = 687.69 : x
  2. Step 2: Convert to fraction form
    697.41/1,038.22 = 687.69/x
  3. Step 3: Cross multiply
    697.41x = 1,038.22 × 687.69
  4. Step 4: Simplify right side
    697.41x = 713,971.79
  5. Step 5: Solve for x
    x = 713,971.79/697.41
  6. Step 6: Final answer
    x = 1,023.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.