Home / 30,972.70-42,749.13-20,363.32

Finding the Fourth Proportional to 30,972.70, 42,749.13 and 20,363.32

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Solution

The fourth proportional to 30,972.70, 42,749.13 and 20,363.32 is: 28,105.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,972.70 : 42,749.13 = 20,363.32 : x
  2. Step 2: Convert to fraction form
    30,972.70/42,749.13 = 20,363.32/x
  3. Step 3: Cross multiply
    30,972.70x = 42,749.13 × 20,363.32
  4. Step 4: Simplify right side
    30,972.70x = 870,514,213.91
  5. Step 5: Solve for x
    x = 870,514,213.91/30,972.70
  6. Step 6: Final answer
    x = 28,105.85

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1.5x scale

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.