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Finding the Fourth Proportional to 78,957.18, 108,909.99 and 47,101.50

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Solution

The fourth proportional to 78,957.18, 108,909.99 and 47,101.50 is: 64,969.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,957.18 : 108,909.99 = 47,101.50 : x
  2. Step 2: Convert to fraction form
    78,957.18/108,909.99 = 47,101.50/x
  3. Step 3: Cross multiply
    78,957.18x = 108,909.99 × 47,101.50
  4. Step 4: Simplify right side
    78,957.18x = 5,129,823,893.99
  5. Step 5: Solve for x
    x = 5,129,823,893.99/78,957.18
  6. Step 6: Final answer
    x = 64,969.69

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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.