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Finding the Fourth Proportional to 858.92, 1,288.65 and 338.99

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Solution

The fourth proportional to 858.92, 1,288.65 and 338.99 is: 508.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.92 : 1,288.65 = 338.99 : x
  2. Step 2: Convert to fraction form
    858.92/1,288.65 = 338.99/x
  3. Step 3: Cross multiply
    858.92x = 1,288.65 × 338.99
  4. Step 4: Simplify right side
    858.92x = 436,839.46
  5. Step 5: Solve for x
    x = 436,839.46/858.92
  6. Step 6: Final answer
    x = 508.59

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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.