Home / 21,278.72-31,887.84-15,688.10

Finding the Fourth Proportional to 21,278.72, 31,887.84 and 15,688.10

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Solution

The fourth proportional to 21,278.72, 31,887.84 and 15,688.10 is: 23,509.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,278.72 : 31,887.84 = 15,688.10 : x
  2. Step 2: Convert to fraction form
    21,278.72/31,887.84 = 15,688.10/x
  3. Step 3: Cross multiply
    21,278.72x = 31,887.84 × 15,688.10
  4. Step 4: Simplify right side
    21,278.72x = 500,259,622.70
  5. Step 5: Solve for x
    x = 500,259,622.70/21,278.72
  6. Step 6: Final answer
    x = 23,509.86

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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.