Home / 21,153.50-31,689.38-11,765.15

Finding the Fourth Proportional to 21,153.50, 31,689.38 and 11,765.15

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Solution

The fourth proportional to 21,153.50, 31,689.38 and 11,765.15 is: 17,624.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,153.50 : 31,689.38 = 11,765.15 : x
  2. Step 2: Convert to fraction form
    21,153.50/31,689.38 = 11,765.15/x
  3. Step 3: Cross multiply
    21,153.50x = 31,689.38 × 11,765.15
  4. Step 4: Simplify right side
    21,153.50x = 372,830,232.73
  5. Step 5: Solve for x
    x = 372,830,232.73/21,153.50
  6. Step 6: Final answer
    x = 17,624.99

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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.