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Finding the Fourth Proportional to 9,981.80, 14,978.70 and 4,137.80

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Solution

The fourth proportional to 9,981.80, 14,978.70 and 4,137.80 is: 6,209.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,981.80 : 14,978.70 = 4,137.80 : x
  2. Step 2: Convert to fraction form
    9,981.80/14,978.70 = 4,137.80/x
  3. Step 3: Cross multiply
    9,981.80x = 14,978.70 × 4,137.80
  4. Step 4: Simplify right side
    9,981.80x = 61,978,864.86
  5. Step 5: Solve for x
    x = 61,978,864.86/9,981.80
  6. Step 6: Final answer
    x = 6,209.19

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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.