Home / 21,280.32-31,920.48-9,579.88

Finding the Fourth Proportional to 21,280.32, 31,920.48 and 9,579.88

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Solution

The fourth proportional to 21,280.32, 31,920.48 and 9,579.88 is: 14,369.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,280.32 : 31,920.48 = 9,579.88 : x
  2. Step 2: Convert to fraction form
    21,280.32/31,920.48 = 9,579.88/x
  3. Step 3: Cross multiply
    21,280.32x = 31,920.48 × 9,579.88
  4. Step 4: Simplify right side
    21,280.32x = 305,794,367.94
  5. Step 5: Solve for x
    x = 305,794,367.94/21,280.32
  6. Step 6: Final answer
    x = 14,369.82

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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.