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Finding the Fourth Proportional to 18,928.60, 28,392.76 and 5,780.92

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Solution

The fourth proportional to 18,928.60, 28,392.76 and 5,780.92 is: 8,671.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,928.60 : 28,392.76 = 5,780.92 : x
  2. Step 2: Convert to fraction form
    18,928.60/28,392.76 = 5,780.92/x
  3. Step 3: Cross multiply
    18,928.60x = 28,392.76 × 5,780.92
  4. Step 4: Simplify right side
    18,928.60x = 164,136,274.14
  5. Step 5: Solve for x
    x = 164,136,274.14/18,928.60
  6. Step 6: Final answer
    x = 8,671.34

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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.