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Finding the Fourth Proportional to 9,991.65, 13,788.53 and 5,515.32

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Solution

The fourth proportional to 9,991.65, 13,788.53 and 5,515.32 is: 7,611.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,991.65 : 13,788.53 = 5,515.32 : x
  2. Step 2: Convert to fraction form
    9,991.65/13,788.53 = 5,515.32/x
  3. Step 3: Cross multiply
    9,991.65x = 13,788.53 × 5,515.32
  4. Step 4: Simplify right side
    9,991.65x = 76,048,127.70
  5. Step 5: Solve for x
    x = 76,048,127.70/9,991.65
  6. Step 6: Final answer
    x = 7,611.17

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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.