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Finding the Fourth Proportional to 28,719, 39,631.50 and 15,972.21

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Solution

The fourth proportional to 28,719, 39,631.50 and 15,972.21 is: 22,041.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,719 : 39,631.50 = 15,972.21 : x
  2. Step 2: Convert to fraction form
    28,719/39,631.50 = 15,972.21/x
  3. Step 3: Cross multiply
    28,719x = 39,631.50 × 15,972.21
  4. Step 4: Simplify right side
    28,719x = 633,002,640.62
  5. Step 5: Solve for x
    x = 633,002,640.62/28,719
  6. Step 6: Final answer
    x = 22,041.25

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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.