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Finding the Fourth Proportional to 15,697.92, 21,646.80 and 11,712.72

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Solution

The fourth proportional to 15,697.92, 21,646.80 and 11,712.72 is: 16,151.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,697.92 : 21,646.80 = 11,712.72 : x
  2. Step 2: Convert to fraction form
    15,697.92/21,646.80 = 11,712.72/x
  3. Step 3: Cross multiply
    15,697.92x = 21,646.80 × 11,712.72
  4. Step 4: Simplify right side
    15,697.92x = 253,542,907.30
  5. Step 5: Solve for x
    x = 253,542,907.30/15,697.92
  6. Step 6: Final answer
    x = 16,151.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.