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Finding the Fourth Proportional to 869.98, 1,199.91 and 520.60

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Solution

The fourth proportional to 869.98, 1,199.91 and 520.60 is: 718.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.98 : 1,199.91 = 520.60 : x
  2. Step 2: Convert to fraction form
    869.98/1,199.91 = 520.60/x
  3. Step 3: Cross multiply
    869.98x = 1,199.91 × 520.60
  4. Step 4: Simplify right side
    869.98x = 624,673.15
  5. Step 5: Solve for x
    x = 624,673.15/869.98
  6. Step 6: Final answer
    x = 718.03

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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.