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Finding the Fourth Proportional to 858.97, 1,288.15 and 311.01

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Solution

The fourth proportional to 858.97, 1,288.15 and 311.01 is: 466.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.97 : 1,288.15 = 311.01 : x
  2. Step 2: Convert to fraction form
    858.97/1,288.15 = 311.01/x
  3. Step 3: Cross multiply
    858.97x = 1,288.15 × 311.01
  4. Step 4: Simplify right side
    858.97x = 400,627.53
  5. Step 5: Solve for x
    x = 400,627.53/858.97
  6. Step 6: Final answer
    x = 466.40

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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.