Home / 21,420.20-29,558.10-12,806.19

Finding the Fourth Proportional to 21,420.20, 29,558.10 and 12,806.19

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Solution

The fourth proportional to 21,420.20, 29,558.10 and 12,806.19 is: 17,671.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,420.20 : 29,558.10 = 12,806.19 : x
  2. Step 2: Convert to fraction form
    21,420.20/29,558.10 = 12,806.19/x
  3. Step 3: Cross multiply
    21,420.20x = 29,558.10 × 12,806.19
  4. Step 4: Simplify right side
    21,420.20x = 378,526,644.64
  5. Step 5: Solve for x
    x = 378,526,644.64/21,420.20
  6. Step 6: Final answer
    x = 17,671.48

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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.