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Finding the Fourth Proportional to 947.72, 1,308.21 and 554.87

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Solution

The fourth proportional to 947.72, 1,308.21 and 554.87 is: 765.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.72 : 1,308.21 = 554.87 : x
  2. Step 2: Convert to fraction form
    947.72/1,308.21 = 554.87/x
  3. Step 3: Cross multiply
    947.72x = 1,308.21 × 554.87
  4. Step 4: Simplify right side
    947.72x = 725,886.48
  5. Step 5: Solve for x
    x = 725,886.48/947.72
  6. Step 6: Final answer
    x = 765.93

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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.