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Finding the Fourth Proportional to 19,318.84, 28,978.98 and 6,840.18

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Solution

The fourth proportional to 19,318.84, 28,978.98 and 6,840.18 is: 10,260.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,318.84 : 28,978.98 = 6,840.18 : x
  2. Step 2: Convert to fraction form
    19,318.84/28,978.98 = 6,840.18/x
  3. Step 3: Cross multiply
    19,318.84x = 28,978.98 × 6,840.18
  4. Step 4: Simplify right side
    19,318.84x = 198,221,439.42
  5. Step 5: Solve for x
    x = 198,221,439.42/19,318.84
  6. Step 6: Final answer
    x = 10,260.52

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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.