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Finding the Fourth Proportional to 7,758.75, 10,707.12 and 4,221.99

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Solution

The fourth proportional to 7,758.75, 10,707.12 and 4,221.99 is: 5,826.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,758.75 : 10,707.12 = 4,221.99 : x
  2. Step 2: Convert to fraction form
    7,758.75/10,707.12 = 4,221.99/x
  3. Step 3: Cross multiply
    7,758.75x = 10,707.12 × 4,221.99
  4. Step 4: Simplify right side
    7,758.75x = 45,205,300.03
  5. Step 5: Solve for x
    x = 45,205,300.03/7,758.75
  6. Step 6: Final answer
    x = 5,826.36

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Half scale
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Double scale
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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.