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Finding the Fourth Proportional to 947.86, 1,308.01 and 528.21

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Solution

The fourth proportional to 947.86, 1,308.01 and 528.21 is: 728.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.86 : 1,308.01 = 528.21 : x
  2. Step 2: Convert to fraction form
    947.86/1,308.01 = 528.21/x
  3. Step 3: Cross multiply
    947.86x = 1,308.01 × 528.21
  4. Step 4: Simplify right side
    947.86x = 690,903.96
  5. Step 5: Solve for x
    x = 690,903.96/947.86
  6. Step 6: Final answer
    x = 728.91

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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.