Home / 21,979.62-30,290.76-15,681.06

Finding the Fourth Proportional to 21,979.62, 30,290.76 and 15,681.06

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Solution

The fourth proportional to 21,979.62, 30,290.76 and 15,681.06 is: 21,610.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,979.62 : 30,290.76 = 15,681.06 : x
  2. Step 2: Convert to fraction form
    21,979.62/30,290.76 = 15,681.06/x
  3. Step 3: Cross multiply
    21,979.62x = 30,290.76 × 15,681.06
  4. Step 4: Simplify right side
    21,979.62x = 474,991,225.01
  5. Step 5: Solve for x
    x = 474,991,225.01/21,979.62
  6. Step 6: Final answer
    x = 21,610.53

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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.