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Finding the Fourth Proportional to 947.64, 1,308.30 and 633.36

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Solution

The fourth proportional to 947.64, 1,308.30 and 633.36 is: 874.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.64 : 1,308.30 = 633.36 : x
  2. Step 2: Convert to fraction form
    947.64/1,308.30 = 633.36/x
  3. Step 3: Cross multiply
    947.64x = 1,308.30 × 633.36
  4. Step 4: Simplify right side
    947.64x = 828,624.89
  5. Step 5: Solve for x
    x = 828,624.89/947.64
  6. Step 6: Final answer
    x = 874.41

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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.