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Finding the Fourth Proportional to 8,980.74, 12,373.16 and 6,618.78

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Solution

The fourth proportional to 8,980.74, 12,373.16 and 6,618.78 is: 9,118.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,980.74 : 12,373.16 = 6,618.78 : x
  2. Step 2: Convert to fraction form
    8,980.74/12,373.16 = 6,618.78/x
  3. Step 3: Cross multiply
    8,980.74x = 12,373.16 × 6,618.78
  4. Step 4: Simplify right side
    8,980.74x = 81,895,190.85
  5. Step 5: Solve for x
    x = 81,895,190.85/8,980.74
  6. Step 6: Final answer
    x = 9,118.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.