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Finding the Fourth Proportional to 72,519.78, 108,701.01 and 28,133.40

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Solution

The fourth proportional to 72,519.78, 108,701.01 and 28,133.40 is: 42,169.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,519.78 : 108,701.01 = 28,133.40 : x
  2. Step 2: Convert to fraction form
    72,519.78/108,701.01 = 28,133.40/x
  3. Step 3: Cross multiply
    72,519.78x = 108,701.01 × 28,133.40
  4. Step 4: Simplify right side
    72,519.78x = 3,058,128,994.73
  5. Step 5: Solve for x
    x = 3,058,128,994.73/72,519.78
  6. Step 6: Final answer
    x = 42,169.58

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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.