Home / 72,688.20-109,010.70-28,289.40

Finding the Fourth Proportional to 72,688.20, 109,010.70 and 28,289.40

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Solution

The fourth proportional to 72,688.20, 109,010.70 and 28,289.40 is: 42,425.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,688.20 : 109,010.70 = 28,289.40 : x
  2. Step 2: Convert to fraction form
    72,688.20/109,010.70 = 28,289.40/x
  3. Step 3: Cross multiply
    72,688.20x = 109,010.70 × 28,289.40
  4. Step 4: Simplify right side
    72,688.20x = 3,083,847,296.58
  5. Step 5: Solve for x
    x = 3,083,847,296.58/72,688.20
  6. Step 6: Final answer
    x = 42,425.69

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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.