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Finding the Fourth Proportional to 21,015.52, 31,523.28 and 5,220.52

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Solution

The fourth proportional to 21,015.52, 31,523.28 and 5,220.52 is: 7,830.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,015.52 : 31,523.28 = 5,220.52 : x
  2. Step 2: Convert to fraction form
    21,015.52/31,523.28 = 5,220.52/x
  3. Step 3: Cross multiply
    21,015.52x = 31,523.28 × 5,220.52
  4. Step 4: Simplify right side
    21,015.52x = 164,567,913.71
  5. Step 5: Solve for x
    x = 164,567,913.71/21,015.52
  6. Step 6: Final answer
    x = 7,830.78

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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.