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Finding the Fourth Proportional to 21,083.76, 31,625.64 and 7,041.20

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Solution

The fourth proportional to 21,083.76, 31,625.64 and 7,041.20 is: 10,561.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,083.76 : 31,625.64 = 7,041.20 : x
  2. Step 2: Convert to fraction form
    21,083.76/31,625.64 = 7,041.20/x
  3. Step 3: Cross multiply
    21,083.76x = 31,625.64 × 7,041.20
  4. Step 4: Simplify right side
    21,083.76x = 222,682,298.24
  5. Step 5: Solve for x
    x = 222,682,298.24/21,083.76
  6. Step 6: Final answer
    x = 10,561.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.