Home / 10,421.28-15,618.36-7,947

Finding the Fourth Proportional to 10,421.28, 15,618.36 and 7,947

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Solution

The fourth proportional to 10,421.28, 15,618.36 and 7,947 is: 11,910.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,421.28 : 15,618.36 = 7,947 : x
  2. Step 2: Convert to fraction form
    10,421.28/15,618.36 = 7,947/x
  3. Step 3: Cross multiply
    10,421.28x = 15,618.36 × 7,947
  4. Step 4: Simplify right side
    10,421.28x = 124,119,106.92
  5. Step 5: Solve for x
    x = 124,119,106.92/10,421.28
  6. Step 6: Final answer
    x = 11,910.16

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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.