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Finding the Fourth Proportional to 679.77, 1,019.88 and 269.02

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Solution

The fourth proportional to 679.77, 1,019.88 and 269.02 is: 403.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.77 : 1,019.88 = 269.02 : x
  2. Step 2: Convert to fraction form
    679.77/1,019.88 = 269.02/x
  3. Step 3: Cross multiply
    679.77x = 1,019.88 × 269.02
  4. Step 4: Simplify right side
    679.77x = 274,368.12
  5. Step 5: Solve for x
    x = 274,368.12/679.77
  6. Step 6: Final answer
    x = 403.62

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.