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Finding the Fourth Proportional to 21,280.32, 31,921.92 and 7,240.32

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Solution

The fourth proportional to 21,280.32, 31,921.92 and 7,240.32 is: 10,860.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,280.32 : 31,921.92 = 7,240.32 : x
  2. Step 2: Convert to fraction form
    21,280.32/31,921.92 = 7,240.32/x
  3. Step 3: Cross multiply
    21,280.32x = 31,921.92 × 7,240.32
  4. Step 4: Simplify right side
    21,280.32x = 231,124,915.81
  5. Step 5: Solve for x
    x = 231,124,915.81/21,280.32
  6. Step 6: Final answer
    x = 10,860.97

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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.