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Finding the Fourth Proportional to 7,875.20, 11,812.80 and 7,721.60

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Solution

The fourth proportional to 7,875.20, 11,812.80 and 7,721.60 is: 11,582.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,875.20 : 11,812.80 = 7,721.60 : x
  2. Step 2: Convert to fraction form
    7,875.20/11,812.80 = 7,721.60/x
  3. Step 3: Cross multiply
    7,875.20x = 11,812.80 × 7,721.60
  4. Step 4: Simplify right side
    7,875.20x = 91,213,716.48
  5. Step 5: Solve for x
    x = 91,213,716.48/7,875.20
  6. Step 6: Final answer
    x = 11,582.40

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Similar ratio
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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.