Home / 11,915.20-17,864.70-5,678.20

Finding the Fourth Proportional to 11,915.20, 17,864.70 and 5,678.20

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Solution

The fourth proportional to 11,915.20, 17,864.70 and 5,678.20 is: 8,513.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,915.20 : 17,864.70 = 5,678.20 : x
  2. Step 2: Convert to fraction form
    11,915.20/17,864.70 = 5,678.20/x
  3. Step 3: Cross multiply
    11,915.20x = 17,864.70 × 5,678.20
  4. Step 4: Simplify right side
    11,915.20x = 101,439,339.54
  5. Step 5: Solve for x
    x = 101,439,339.54/11,915.20
  6. Step 6: Final answer
    x = 8,513.44

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1.5x scale

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.