Home / 21,001.12-28,981.20-11,570.56

Finding the Fourth Proportional to 21,001.12, 28,981.20 and 11,570.56

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Solution

The fourth proportional to 21,001.12, 28,981.20 and 11,570.56 is: 15,967.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,001.12 : 28,981.20 = 11,570.56 : x
  2. Step 2: Convert to fraction form
    21,001.12/28,981.20 = 11,570.56/x
  3. Step 3: Cross multiply
    21,001.12x = 28,981.20 × 11,570.56
  4. Step 4: Simplify right side
    21,001.12x = 335,328,713.47
  5. Step 5: Solve for x
    x = 335,328,713.47/21,001.12
  6. Step 6: Final answer
    x = 15,967.18

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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.