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Finding the Fourth Proportional to 8,978.15, 12,388.40 and 5,201.66

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Solution

The fourth proportional to 8,978.15, 12,388.40 and 5,201.66 is: 7,177.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,978.15 : 12,388.40 = 5,201.66 : x
  2. Step 2: Convert to fraction form
    8,978.15/12,388.40 = 5,201.66/x
  3. Step 3: Cross multiply
    8,978.15x = 12,388.40 × 5,201.66
  4. Step 4: Simplify right side
    8,978.15x = 64,440,218.74
  5. Step 5: Solve for x
    x = 64,440,218.74/8,978.15
  6. Step 6: Final answer
    x = 7,177.45

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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.