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Finding the Fourth Proportional to 855.56, 1,283.66 and 509.09

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Solution

The fourth proportional to 855.56, 1,283.66 and 509.09 is: 763.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.56 : 1,283.66 = 509.09 : x
  2. Step 2: Convert to fraction form
    855.56/1,283.66 = 509.09/x
  3. Step 3: Cross multiply
    855.56x = 1,283.66 × 509.09
  4. Step 4: Simplify right side
    855.56x = 653,495.92
  5. Step 5: Solve for x
    x = 653,495.92/855.56
  6. Step 6: Final answer
    x = 763.83

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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.