Home / 15,301.91-21,111.23-9,999.80

Finding the Fourth Proportional to 15,301.91, 21,111.23 and 9,999.80

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Solution

The fourth proportional to 15,301.91, 21,111.23 and 9,999.80 is: 13,796.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,301.91 : 21,111.23 = 9,999.80 : x
  2. Step 2: Convert to fraction form
    15,301.91/21,111.23 = 9,999.80/x
  3. Step 3: Cross multiply
    15,301.91x = 21,111.23 × 9,999.80
  4. Step 4: Simplify right side
    15,301.91x = 211,108,080.53
  5. Step 5: Solve for x
    x = 211,108,080.53/15,301.91
  6. Step 6: Final answer
    x = 13,796.19

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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.