Home / 21,061.80-29,054.34-15,689.88

Finding the Fourth Proportional to 21,061.80, 29,054.34 and 15,689.88

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Solution

The fourth proportional to 21,061.80, 29,054.34 and 15,689.88 is: 21,643.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,061.80 : 29,054.34 = 15,689.88 : x
  2. Step 2: Convert to fraction form
    21,061.80/29,054.34 = 15,689.88/x
  3. Step 3: Cross multiply
    21,061.80x = 29,054.34 × 15,689.88
  4. Step 4: Simplify right side
    21,061.80x = 455,859,108.08
  5. Step 5: Solve for x
    x = 455,859,108.08/21,061.80
  6. Step 6: Final answer
    x = 21,643.88

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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.