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Finding the Fourth Proportional to 78,920.71, 108,908.79 and 43,110.88

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Solution

The fourth proportional to 78,920.71, 108,908.79 and 43,110.88 is: 59,492.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,920.71 : 108,908.79 = 43,110.88 : x
  2. Step 2: Convert to fraction form
    78,920.71/108,908.79 = 43,110.88/x
  3. Step 3: Cross multiply
    78,920.71x = 108,908.79 × 43,110.88
  4. Step 4: Simplify right side
    78,920.71x = 4,695,153,288.81
  5. Step 5: Solve for x
    x = 4,695,153,288.81/78,920.71
  6. Step 6: Final answer
    x = 59,492.03

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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.