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Finding the Fourth Proportional to 10,439.29, 15,648 and 7,661.80

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Solution

The fourth proportional to 10,439.29, 15,648 and 7,661.80 is: 11,484.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,439.29 : 15,648 = 7,661.80 : x
  2. Step 2: Convert to fraction form
    10,439.29/15,648 = 7,661.80/x
  3. Step 3: Cross multiply
    10,439.29x = 15,648 × 7,661.80
  4. Step 4: Simplify right side
    10,439.29x = 119,891,846.40
  5. Step 5: Solve for x
    x = 119,891,846.40/10,439.29
  6. Step 6: Final answer
    x = 11,484.67

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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.