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Finding the Fourth Proportional to 947.34, 1,420.44 and 391.61

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Solution

The fourth proportional to 947.34, 1,420.44 and 391.61 is: 587.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.34 : 1,420.44 = 391.61 : x
  2. Step 2: Convert to fraction form
    947.34/1,420.44 = 391.61/x
  3. Step 3: Cross multiply
    947.34x = 1,420.44 × 391.61
  4. Step 4: Simplify right side
    947.34x = 556,251.41
  5. Step 5: Solve for x
    x = 556,251.41/947.34
  6. Step 6: Final answer
    x = 587.17

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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.