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Finding the Fourth Proportional to 947.49, 1,421.28 and 330.90

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Solution

The fourth proportional to 947.49, 1,421.28 and 330.90 is: 496.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.49 : 1,421.28 = 330.90 : x
  2. Step 2: Convert to fraction form
    947.49/1,421.28 = 330.90/x
  3. Step 3: Cross multiply
    947.49x = 1,421.28 × 330.90
  4. Step 4: Simplify right side
    947.49x = 470,301.55
  5. Step 5: Solve for x
    x = 470,301.55/947.49
  6. Step 6: Final answer
    x = 496.37

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Double scale
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1.5x scale

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.