Home / 21,090.78-29,111.40-14,398.56

Finding the Fourth Proportional to 21,090.78, 29,111.40 and 14,398.56

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Solution

The fourth proportional to 21,090.78, 29,111.40 and 14,398.56 is: 19,874.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,090.78 : 29,111.40 = 14,398.56 : x
  2. Step 2: Convert to fraction form
    21,090.78/29,111.40 = 14,398.56/x
  3. Step 3: Cross multiply
    21,090.78x = 29,111.40 × 14,398.56
  4. Step 4: Simplify right side
    21,090.78x = 419,162,239.58
  5. Step 5: Solve for x
    x = 419,162,239.58/21,090.78
  6. Step 6: Final answer
    x = 19,874.19

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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.