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Finding the Fourth Proportional to 18,870.64, 28,310.11 and 5,724.07

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Solution

The fourth proportional to 18,870.64, 28,310.11 and 5,724.07 is: 8,587.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,870.64 : 28,310.11 = 5,724.07 : x
  2. Step 2: Convert to fraction form
    18,870.64/28,310.11 = 5,724.07/x
  3. Step 3: Cross multiply
    18,870.64x = 28,310.11 × 5,724.07
  4. Step 4: Simplify right side
    18,870.64x = 162,048,966.26
  5. Step 5: Solve for x
    x = 162,048,966.26/18,870.64
  6. Step 6: Final answer
    x = 8,587.36

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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.