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Finding the Fourth Proportional to 871.51, 1,308.05 and 778.82

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Solution

The fourth proportional to 871.51, 1,308.05 and 778.82 is: 1,168.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.51 : 1,308.05 = 778.82 : x
  2. Step 2: Convert to fraction form
    871.51/1,308.05 = 778.82/x
  3. Step 3: Cross multiply
    871.51x = 1,308.05 × 778.82
  4. Step 4: Simplify right side
    871.51x = 1,018,731.61
  5. Step 5: Solve for x
    x = 1,018,731.61/871.51
  6. Step 6: Final answer
    x = 1,168.93

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.