Home / 21,121.48-29,149.86-15,806.98

Finding the Fourth Proportional to 21,121.48, 29,149.86 and 15,806.98

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Solution

The fourth proportional to 21,121.48, 29,149.86 and 15,806.98 is: 21,815.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.48 : 29,149.86 = 15,806.98 : x
  2. Step 2: Convert to fraction form
    21,121.48/29,149.86 = 15,806.98/x
  3. Step 3: Cross multiply
    21,121.48x = 29,149.86 × 15,806.98
  4. Step 4: Simplify right side
    21,121.48x = 460,771,254.02
  5. Step 5: Solve for x
    x = 460,771,254.02/21,121.48
  6. Step 6: Final answer
    x = 21,815.29

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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.