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Finding the Fourth Proportional to 19,479.87, 26,884.23 and 11,931.21

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Solution

The fourth proportional to 19,479.87, 26,884.23 and 11,931.21 is: 16,466.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,479.87 : 26,884.23 = 11,931.21 : x
  2. Step 2: Convert to fraction form
    19,479.87/26,884.23 = 11,931.21/x
  3. Step 3: Cross multiply
    19,479.87x = 26,884.23 × 11,931.21
  4. Step 4: Simplify right side
    19,479.87x = 320,761,393.82
  5. Step 5: Solve for x
    x = 320,761,393.82/19,479.87
  6. Step 6: Final answer
    x = 16,466.30

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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.