Home / 21,280.78-31,921.26-7,429.78

Finding the Fourth Proportional to 21,280.78, 31,921.26 and 7,429.78

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Solution

The fourth proportional to 21,280.78, 31,921.26 and 7,429.78 is: 11,144.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,280.78 : 31,921.26 = 7,429.78 : x
  2. Step 2: Convert to fraction form
    21,280.78/31,921.26 = 7,429.78/x
  3. Step 3: Cross multiply
    21,280.78x = 31,921.26 × 7,429.78
  4. Step 4: Simplify right side
    21,280.78x = 237,167,939.12
  5. Step 5: Solve for x
    x = 237,167,939.12/21,280.78
  6. Step 6: Final answer
    x = 11,144.70

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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.