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Finding the Fourth Proportional to 3,607.81, 4,978.92 and 2,115.52

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Solution

The fourth proportional to 3,607.81, 4,978.92 and 2,115.52 is: 2,919.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,607.81 : 4,978.92 = 2,115.52 : x
  2. Step 2: Convert to fraction form
    3,607.81/4,978.92 = 2,115.52/x
  3. Step 3: Cross multiply
    3,607.81x = 4,978.92 × 2,115.52
  4. Step 4: Simplify right side
    3,607.81x = 10,533,004.84
  5. Step 5: Solve for x
    x = 10,533,004.84/3,607.81
  6. Step 6: Final answer
    x = 2,919.50

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1.5x scale

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.