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Finding the Fourth Proportional to 19,931.70, 27,475.70 and 16,388.76

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Solution

The fourth proportional to 19,931.70, 27,475.70 and 16,388.76 is: 22,591.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,931.70 : 27,475.70 = 16,388.76 : x
  2. Step 2: Convert to fraction form
    19,931.70/27,475.70 = 16,388.76/x
  3. Step 3: Cross multiply
    19,931.70x = 27,475.70 × 16,388.76
  4. Step 4: Simplify right side
    19,931.70x = 450,292,653.13
  5. Step 5: Solve for x
    x = 450,292,653.13/19,931.70
  6. Step 6: Final answer
    x = 22,591.78

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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.