Home / 21,979.95-30,302.21-13,909.59

Finding the Fourth Proportional to 21,979.95, 30,302.21 and 13,909.59

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Solution

The fourth proportional to 21,979.95, 30,302.21 and 13,909.59 is: 19,176.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,979.95 : 30,302.21 = 13,909.59 : x
  2. Step 2: Convert to fraction form
    21,979.95/30,302.21 = 13,909.59/x
  3. Step 3: Cross multiply
    21,979.95x = 30,302.21 × 13,909.59
  4. Step 4: Simplify right side
    21,979.95x = 421,491,247.65
  5. Step 5: Solve for x
    x = 421,491,247.65/21,979.95
  6. Step 6: Final answer
    x = 19,176.17

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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.