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Finding the Fourth Proportional to 72,320.80, 108,481.20 and 19,730.20

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Solution

The fourth proportional to 72,320.80, 108,481.20 and 19,730.20 is: 29,595.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,320.80 : 108,481.20 = 19,730.20 : x
  2. Step 2: Convert to fraction form
    72,320.80/108,481.20 = 19,730.20/x
  3. Step 3: Cross multiply
    72,320.80x = 108,481.20 × 19,730.20
  4. Step 4: Simplify right side
    72,320.80x = 2,140,355,772.24
  5. Step 5: Solve for x
    x = 2,140,355,772.24/72,320.80
  6. Step 6: Final answer
    x = 29,595.30

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1.5x scale

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.