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Finding the Fourth Proportional to 3,607.86, 4,978.95 and 2,115.84

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Solution

The fourth proportional to 3,607.86, 4,978.95 and 2,115.84 is: 2,919.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,607.86 : 4,978.95 = 2,115.84 : x
  2. Step 2: Convert to fraction form
    3,607.86/4,978.95 = 2,115.84/x
  3. Step 3: Cross multiply
    3,607.86x = 4,978.95 × 2,115.84
  4. Step 4: Simplify right side
    3,607.86x = 10,534,661.57
  5. Step 5: Solve for x
    x = 10,534,661.57/3,607.86
  6. Step 6: Final answer
    x = 2,919.92

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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.