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Finding the Fourth Proportional to 699.79, 1,049.81 and 288.70

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Solution

The fourth proportional to 699.79, 1,049.81 and 288.70 is: 433.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.79 : 1,049.81 = 288.70 : x
  2. Step 2: Convert to fraction form
    699.79/1,049.81 = 288.70/x
  3. Step 3: Cross multiply
    699.79x = 1,049.81 × 288.70
  4. Step 4: Simplify right side
    699.79x = 303,081.10
  5. Step 5: Solve for x
    x = 303,081.10/699.79
  6. Step 6: Final answer
    x = 433.10

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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.