Home / 19,920.92-29,881.40-8,221.28

Finding the Fourth Proportional to 19,920.92, 29,881.40 and 8,221.28

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Solution

The fourth proportional to 19,920.92, 29,881.40 and 8,221.28 is: 12,331.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,920.92 : 29,881.40 = 8,221.28 : x
  2. Step 2: Convert to fraction form
    19,920.92/29,881.40 = 8,221.28/x
  3. Step 3: Cross multiply
    19,920.92x = 29,881.40 × 8,221.28
  4. Step 4: Simplify right side
    19,920.92x = 245,663,356.19
  5. Step 5: Solve for x
    x = 245,663,356.19/19,920.92
  6. Step 6: Final answer
    x = 12,331.93

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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.