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Finding the Fourth Proportional to 18,871.84, 28,307.82 and 5,724.32

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Solution

The fourth proportional to 18,871.84, 28,307.82 and 5,724.32 is: 8,586.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,871.84 : 28,307.82 = 5,724.32 : x
  2. Step 2: Convert to fraction form
    18,871.84/28,307.82 = 5,724.32/x
  3. Step 3: Cross multiply
    18,871.84x = 28,307.82 × 5,724.32
  4. Step 4: Simplify right side
    18,871.84x = 162,043,020.18
  5. Step 5: Solve for x
    x = 162,043,020.18/18,871.84
  6. Step 6: Final answer
    x = 8,586.50

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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.