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Finding the Fourth Proportional to 869.43, 1,199.79 and 520.05

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Solution

The fourth proportional to 869.43, 1,199.79 and 520.05 is: 717.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.43 : 1,199.79 = 520.05 : x
  2. Step 2: Convert to fraction form
    869.43/1,199.79 = 520.05/x
  3. Step 3: Cross multiply
    869.43x = 1,199.79 × 520.05
  4. Step 4: Simplify right side
    869.43x = 623,950.79
  5. Step 5: Solve for x
    x = 623,950.79/869.43
  6. Step 6: Final answer
    x = 717.66

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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.