Home / 15,890.49-21,929.01-8,720.40

Finding the Fourth Proportional to 15,890.49, 21,929.01 and 8,720.40

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Solution

The fourth proportional to 15,890.49, 21,929.01 and 8,720.40 is: 12,034.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,890.49 : 21,929.01 = 8,720.40 : x
  2. Step 2: Convert to fraction form
    15,890.49/21,929.01 = 8,720.40/x
  3. Step 3: Cross multiply
    15,890.49x = 21,929.01 × 8,720.40
  4. Step 4: Simplify right side
    15,890.49x = 191,229,738.80
  5. Step 5: Solve for x
    x = 191,229,738.80/15,890.49
  6. Step 6: Final answer
    x = 12,034.23

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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.