Home / 66,438.28-99,640.44-19,680.24

Finding the Fourth Proportional to 66,438.28, 99,640.44 and 19,680.24

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Solution

The fourth proportional to 66,438.28, 99,640.44 and 19,680.24 is: 29,515.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,438.28 : 99,640.44 = 19,680.24 : x
  2. Step 2: Convert to fraction form
    66,438.28/99,640.44 = 19,680.24/x
  3. Step 3: Cross multiply
    66,438.28x = 99,640.44 × 19,680.24
  4. Step 4: Simplify right side
    66,438.28x = 1,960,947,772.91
  5. Step 5: Solve for x
    x = 1,960,947,772.91/66,438.28
  6. Step 6: Final answer
    x = 29,515.33

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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.