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Finding the Fourth Proportional to 859.82, 1,290.28 and 311.95

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Solution

The fourth proportional to 859.82, 1,290.28 and 311.95 is: 468.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.82 : 1,290.28 = 311.95 : x
  2. Step 2: Convert to fraction form
    859.82/1,290.28 = 311.95/x
  3. Step 3: Cross multiply
    859.82x = 1,290.28 × 311.95
  4. Step 4: Simplify right side
    859.82x = 402,502.85
  5. Step 5: Solve for x
    x = 402,502.85/859.82
  6. Step 6: Final answer
    x = 468.13

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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.