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Finding the Fourth Proportional to 19,316.85, 28,978.55 and 5,986.80

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Solution

The fourth proportional to 19,316.85, 28,978.55 and 5,986.80 is: 8,981.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,316.85 : 28,978.55 = 5,986.80 : x
  2. Step 2: Convert to fraction form
    19,316.85/28,978.55 = 5,986.80/x
  3. Step 3: Cross multiply
    19,316.85x = 28,978.55 × 5,986.80
  4. Step 4: Simplify right side
    19,316.85x = 173,488,753.21
  5. Step 5: Solve for x
    x = 173,488,753.21/19,316.85
  6. Step 6: Final answer
    x = 8,981.21

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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.