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Finding the Fourth Proportional to 947.39, 1,421.13 and 298.13

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Solution

The fourth proportional to 947.39, 1,421.13 and 298.13 is: 447.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.39 : 1,421.13 = 298.13 : x
  2. Step 2: Convert to fraction form
    947.39/1,421.13 = 298.13/x
  3. Step 3: Cross multiply
    947.39x = 1,421.13 × 298.13
  4. Step 4: Simplify right side
    947.39x = 423,672.89
  5. Step 5: Solve for x
    x = 423,672.89/947.39
  6. Step 6: Final answer
    x = 447.20

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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.