Home / 21,490-29,659.44-13,111.36

Finding the Fourth Proportional to 21,490, 29,659.44 and 13,111.36

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Solution

The fourth proportional to 21,490, 29,659.44 and 13,111.36 is: 18,095.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,490 : 29,659.44 = 13,111.36 : x
  2. Step 2: Convert to fraction form
    21,490/29,659.44 = 13,111.36/x
  3. Step 3: Cross multiply
    21,490x = 29,659.44 × 13,111.36
  4. Step 4: Simplify right side
    21,490x = 388,875,595.24
  5. Step 5: Solve for x
    x = 388,875,595.24/21,490
  6. Step 6: Final answer
    x = 18,095.65

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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.