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Finding the Fourth Proportional to 947.05, 1,306.87 and 554.29

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Solution

The fourth proportional to 947.05, 1,306.87 and 554.29 is: 764.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.05 : 1,306.87 = 554.29 : x
  2. Step 2: Convert to fraction form
    947.05/1,306.87 = 554.29/x
  3. Step 3: Cross multiply
    947.05x = 1,306.87 × 554.29
  4. Step 4: Simplify right side
    947.05x = 724,384.97
  5. Step 5: Solve for x
    x = 724,384.97/947.05
  6. Step 6: Final answer
    x = 764.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.