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Finding the Fourth Proportional to 11,559.80, 17,347.80 and 4,990.70

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Solution

The fourth proportional to 11,559.80, 17,347.80 and 4,990.70 is: 7,489.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,559.80 : 17,347.80 = 4,990.70 : x
  2. Step 2: Convert to fraction form
    11,559.80/17,347.80 = 4,990.70/x
  3. Step 3: Cross multiply
    11,559.80x = 17,347.80 × 4,990.70
  4. Step 4: Simplify right side
    11,559.80x = 86,577,665.46
  5. Step 5: Solve for x
    x = 86,577,665.46/11,559.80
  6. Step 6: Final answer
    x = 7,489.55

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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.