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Finding the Fourth Proportional to 868.88, 1,199.40 and 519.50

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Solution

The fourth proportional to 868.88, 1,199.40 and 519.50 is: 717.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.88 : 1,199.40 = 519.50 : x
  2. Step 2: Convert to fraction form
    868.88/1,199.40 = 519.50/x
  3. Step 3: Cross multiply
    868.88x = 1,199.40 × 519.50
  4. Step 4: Simplify right side
    868.88x = 623,088.30
  5. Step 5: Solve for x
    x = 623,088.30/868.88
  6. Step 6: Final answer
    x = 717.12

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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.