Home / 20,979.98-28,952.67-11,420.16

Finding the Fourth Proportional to 20,979.98, 28,952.67 and 11,420.16

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Solution

The fourth proportional to 20,979.98, 28,952.67 and 11,420.16 is: 15,759.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.98 : 28,952.67 = 11,420.16 : x
  2. Step 2: Convert to fraction form
    20,979.98/28,952.67 = 11,420.16/x
  3. Step 3: Cross multiply
    20,979.98x = 28,952.67 × 11,420.16
  4. Step 4: Simplify right side
    20,979.98x = 330,644,123.83
  5. Step 5: Solve for x
    x = 330,644,123.83/20,979.98
  6. Step 6: Final answer
    x = 15,759.98

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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.