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Finding the Fourth Proportional to 20,937.60, 28,890.40 and 13,873.60

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Solution

The fourth proportional to 20,937.60, 28,890.40 and 13,873.60 is: 19,143.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,937.60 : 28,890.40 = 13,873.60 : x
  2. Step 2: Convert to fraction form
    20,937.60/28,890.40 = 13,873.60/x
  3. Step 3: Cross multiply
    20,937.60x = 28,890.40 × 13,873.60
  4. Step 4: Simplify right side
    20,937.60x = 400,813,853.44
  5. Step 5: Solve for x
    x = 400,813,853.44/20,937.60
  6. Step 6: Final answer
    x = 19,143.26

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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.