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Finding the Fourth Proportional to 21,291.61, 31,942.36 and 7,251.76

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Solution

The fourth proportional to 21,291.61, 31,942.36 and 7,251.76 is: 10,879.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,291.61 : 31,942.36 = 7,251.76 : x
  2. Step 2: Convert to fraction form
    21,291.61/31,942.36 = 7,251.76/x
  3. Step 3: Cross multiply
    21,291.61x = 31,942.36 × 7,251.76
  4. Step 4: Simplify right side
    21,291.61x = 231,638,328.55
  5. Step 5: Solve for x
    x = 231,638,328.55/21,291.61
  6. Step 6: Final answer
    x = 10,879.32

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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.