Home / 21,116.79-31,686.12-15,321.24

Finding the Fourth Proportional to 21,116.79, 31,686.12 and 15,321.24

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Solution

The fourth proportional to 21,116.79, 31,686.12 and 15,321.24 is: 22,989.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,116.79 : 31,686.12 = 15,321.24 : x
  2. Step 2: Convert to fraction form
    21,116.79/31,686.12 = 15,321.24/x
  3. Step 3: Cross multiply
    21,116.79x = 31,686.12 × 15,321.24
  4. Step 4: Simplify right side
    21,116.79x = 485,470,649.19
  5. Step 5: Solve for x
    x = 485,470,649.19/21,116.79
  6. Step 6: Final answer
    x = 22,989.79

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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.