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Finding the Fourth Proportional to 72,656.64, 108,984.15 and 51,221.12

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Solution

The fourth proportional to 72,656.64, 108,984.15 and 51,221.12 is: 76,831.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,656.64 : 108,984.15 = 51,221.12 : x
  2. Step 2: Convert to fraction form
    72,656.64/108,984.15 = 51,221.12/x
  3. Step 3: Cross multiply
    72,656.64x = 108,984.15 × 51,221.12
  4. Step 4: Simplify right side
    72,656.64x = 5,582,289,680.33
  5. Step 5: Solve for x
    x = 5,582,289,680.33/72,656.64
  6. Step 6: Final answer
    x = 76,831.10

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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.