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Finding the Fourth Proportional to 947.99, 1,308.15 and 528.31

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Solution

The fourth proportional to 947.99, 1,308.15 and 528.31 is: 729.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.99 : 1,308.15 = 528.31 : x
  2. Step 2: Convert to fraction form
    947.99/1,308.15 = 528.31/x
  3. Step 3: Cross multiply
    947.99x = 1,308.15 × 528.31
  4. Step 4: Simplify right side
    947.99x = 691,110.36
  5. Step 5: Solve for x
    x = 691,110.36/947.99
  6. Step 6: Final answer
    x = 729.03

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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.