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Finding the Fourth Proportional to 81,308.76, 121,911.12 and 39,104.79

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Solution

The fourth proportional to 81,308.76, 121,911.12 and 39,104.79 is: 58,632.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,308.76 : 121,911.12 = 39,104.79 : x
  2. Step 2: Convert to fraction form
    81,308.76/121,911.12 = 39,104.79/x
  3. Step 3: Cross multiply
    81,308.76x = 121,911.12 × 39,104.79
  4. Step 4: Simplify right side
    81,308.76x = 4,767,307,941.19
  5. Step 5: Solve for x
    x = 4,767,307,941.19/81,308.76
  6. Step 6: Final answer
    x = 58,632.16

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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.