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Finding the Fourth Proportional to 7,920.48, 10,909.98 and 6,660.12

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Solution

The fourth proportional to 7,920.48, 10,909.98 and 6,660.12 is: 9,173.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,920.48 : 10,909.98 = 6,660.12 : x
  2. Step 2: Convert to fraction form
    7,920.48/10,909.98 = 6,660.12/x
  3. Step 3: Cross multiply
    7,920.48x = 10,909.98 × 6,660.12
  4. Step 4: Simplify right side
    7,920.48x = 72,661,776.00
  5. Step 5: Solve for x
    x = 72,661,776.00/7,920.48
  6. Step 6: Final answer
    x = 9,173.91

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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.