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Finding the Fourth Proportional to 21,079.90, 31,616.20 and 7,228.90

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Solution

The fourth proportional to 21,079.90, 31,616.20 and 7,228.90 is: 10,842.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,079.90 : 31,616.20 = 7,228.90 : x
  2. Step 2: Convert to fraction form
    21,079.90/31,616.20 = 7,228.90/x
  3. Step 3: Cross multiply
    21,079.90x = 31,616.20 × 7,228.90
  4. Step 4: Simplify right side
    21,079.90x = 228,550,153.95
  5. Step 5: Solve for x
    x = 228,550,153.95/21,079.90
  6. Step 6: Final answer
    x = 10,842.09

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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.