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Finding the Fourth Proportional to 9,990.87, 13,787.40 and 5,514.94

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Solution

The fourth proportional to 9,990.87, 13,787.40 and 5,514.94 is: 7,610.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,990.87 : 13,787.40 = 5,514.94 : x
  2. Step 2: Convert to fraction form
    9,990.87/13,787.40 = 5,514.94/x
  3. Step 3: Cross multiply
    9,990.87x = 13,787.40 × 5,514.94
  4. Step 4: Simplify right side
    9,990.87x = 76,036,683.76
  5. Step 5: Solve for x
    x = 76,036,683.76/9,990.87
  6. Step 6: Final answer
    x = 7,610.62

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1.5x scale

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.