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Finding the Fourth Proportional to 947.08, 1,420.08 and 330.70

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Solution

The fourth proportional to 947.08, 1,420.08 and 330.70 is: 495.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.08 : 1,420.08 = 330.70 : x
  2. Step 2: Convert to fraction form
    947.08/1,420.08 = 330.70/x
  3. Step 3: Cross multiply
    947.08x = 1,420.08 × 330.70
  4. Step 4: Simplify right side
    947.08x = 469,620.46
  5. Step 5: Solve for x
    x = 469,620.46/947.08
  6. Step 6: Final answer
    x = 495.86

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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.