Home / 21,979.56-30,333.65-12,421.19

Finding the Fourth Proportional to 21,979.56, 30,333.65 and 12,421.19

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Solution

The fourth proportional to 21,979.56, 30,333.65 and 12,421.19 is: 17,142.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,979.56 : 30,333.65 = 12,421.19 : x
  2. Step 2: Convert to fraction form
    21,979.56/30,333.65 = 12,421.19/x
  3. Step 3: Cross multiply
    21,979.56x = 30,333.65 × 12,421.19
  4. Step 4: Simplify right side
    21,979.56x = 376,780,030.04
  5. Step 5: Solve for x
    x = 376,780,030.04/21,979.56
  6. Step 6: Final answer
    x = 17,142.29

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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.