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Finding the Fourth Proportional to 947.98, 1,308.17 and 528.32

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Solution

The fourth proportional to 947.98, 1,308.17 and 528.32 is: 729.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.98 : 1,308.17 = 528.32 : x
  2. Step 2: Convert to fraction form
    947.98/1,308.17 = 528.32/x
  3. Step 3: Cross multiply
    947.98x = 1,308.17 × 528.32
  4. Step 4: Simplify right side
    947.98x = 691,132.37
  5. Step 5: Solve for x
    x = 691,132.37/947.98
  6. Step 6: Final answer
    x = 729.06

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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.