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Finding the Fourth Proportional to 21,211.80, 31,818.06 and 6,420.90

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Solution

The fourth proportional to 21,211.80, 31,818.06 and 6,420.90 is: 9,631.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,211.80 : 31,818.06 = 6,420.90 : x
  2. Step 2: Convert to fraction form
    21,211.80/31,818.06 = 6,420.90/x
  3. Step 3: Cross multiply
    21,211.80x = 31,818.06 × 6,420.90
  4. Step 4: Simplify right side
    21,211.80x = 204,300,581.45
  5. Step 5: Solve for x
    x = 204,300,581.45/21,211.80
  6. Step 6: Final answer
    x = 9,631.46

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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.