Home / 20,971.62-28,972.62-15,657.21

Finding the Fourth Proportional to 20,971.62, 28,972.62 and 15,657.21

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Solution

The fourth proportional to 20,971.62, 28,972.62 and 15,657.21 is: 21,630.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,971.62 : 28,972.62 = 15,657.21 : x
  2. Step 2: Convert to fraction form
    20,971.62/28,972.62 = 15,657.21/x
  3. Step 3: Cross multiply
    20,971.62x = 28,972.62 × 15,657.21
  4. Step 4: Simplify right side
    20,971.62x = 453,630,395.59
  5. Step 5: Solve for x
    x = 453,630,395.59/20,971.62
  6. Step 6: Final answer
    x = 21,630.68

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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.