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Finding the Fourth Proportional to 868.84, 1,197.66 and 619.72

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Solution

The fourth proportional to 868.84, 1,197.66 and 619.72 is: 854.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.84 : 1,197.66 = 619.72 : x
  2. Step 2: Convert to fraction form
    868.84/1,197.66 = 619.72/x
  3. Step 3: Cross multiply
    868.84x = 1,197.66 × 619.72
  4. Step 4: Simplify right side
    868.84x = 742,213.86
  5. Step 5: Solve for x
    x = 742,213.86/868.84
  6. Step 6: Final answer
    x = 854.26

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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.