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Finding the Fourth Proportional to 18,905.71, 28,364.88 and 8,374.30

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Solution

The fourth proportional to 18,905.71, 28,364.88 and 8,374.30 is: 12,564.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,905.71 : 28,364.88 = 8,374.30 : x
  2. Step 2: Convert to fraction form
    18,905.71/28,364.88 = 8,374.30/x
  3. Step 3: Cross multiply
    18,905.71x = 28,364.88 × 8,374.30
  4. Step 4: Simplify right side
    18,905.71x = 237,536,014.58
  5. Step 5: Solve for x
    x = 237,536,014.58/18,905.71
  6. Step 6: Final answer
    x = 12,564.25

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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.