Home / 20,979.42-28,960.67-15,000.70

Finding the Fourth Proportional to 20,979.42, 28,960.67 and 15,000.70

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Solution

The fourth proportional to 20,979.42, 28,960.67 and 15,000.70 is: 20,707.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.42 : 28,960.67 = 15,000.70 : x
  2. Step 2: Convert to fraction form
    20,979.42/28,960.67 = 15,000.70/x
  3. Step 3: Cross multiply
    20,979.42x = 28,960.67 × 15,000.70
  4. Step 4: Simplify right side
    20,979.42x = 434,430,322.47
  5. Step 5: Solve for x
    x = 434,430,322.47/20,979.42
  6. Step 6: Final answer
    x = 20,707.45

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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.