Home / 21,382.79-29,517.21-15,762.20

Finding the Fourth Proportional to 21,382.79, 29,517.21 and 15,762.20

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Solution

The fourth proportional to 21,382.79, 29,517.21 and 15,762.20 is: 21,758.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,382.79 : 29,517.21 = 15,762.20 : x
  2. Step 2: Convert to fraction form
    21,382.79/29,517.21 = 15,762.20/x
  3. Step 3: Cross multiply
    21,382.79x = 29,517.21 × 15,762.20
  4. Step 4: Simplify right side
    21,382.79x = 465,256,019.88
  5. Step 5: Solve for x
    x = 465,256,019.88/21,382.79
  6. Step 6: Final answer
    x = 21,758.44

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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.