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Finding the Fourth Proportional to 72,699.36, 109,027.96 and 28,316.20

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Solution

The fourth proportional to 72,699.36, 109,027.96 and 28,316.20 is: 42,466.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,699.36 : 109,027.96 = 28,316.20 : x
  2. Step 2: Convert to fraction form
    72,699.36/109,027.96 = 28,316.20/x
  3. Step 3: Cross multiply
    72,699.36x = 109,027.96 × 28,316.20
  4. Step 4: Simplify right side
    72,699.36x = 3,087,257,520.95
  5. Step 5: Solve for x
    x = 3,087,257,520.95/72,699.36
  6. Step 6: Final answer
    x = 42,466.09

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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.