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Finding the Fourth Proportional to 21,077.60, 31,616.08 and 6,286.40

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Solution

The fourth proportional to 21,077.60, 31,616.08 and 6,286.40 is: 9,429.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,077.60 : 31,616.08 = 6,286.40 : x
  2. Step 2: Convert to fraction form
    21,077.60/31,616.08 = 6,286.40/x
  3. Step 3: Cross multiply
    21,077.60x = 31,616.08 × 6,286.40
  4. Step 4: Simplify right side
    21,077.60x = 198,751,325.31
  5. Step 5: Solve for x
    x = 198,751,325.31/21,077.60
  6. Step 6: Final answer
    x = 9,429.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.