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Finding the Fourth Proportional to 28,967, 39,974.46 and 15,719

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Solution

The fourth proportional to 28,967, 39,974.46 and 15,719 is: 21,692.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,967 : 39,974.46 = 15,719 : x
  2. Step 2: Convert to fraction form
    28,967/39,974.46 = 15,719/x
  3. Step 3: Cross multiply
    28,967x = 39,974.46 × 15,719
  4. Step 4: Simplify right side
    28,967x = 628,358,536.74
  5. Step 5: Solve for x
    x = 628,358,536.74/28,967
  6. Step 6: Final answer
    x = 21,692.22

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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.