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Finding the Fourth Proportional to 7,831.80, 10,979.10 and 7,831.80

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Solution

The fourth proportional to 7,831.80, 10,979.10 and 7,831.80 is: 10,979.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,831.80 : 10,979.10 = 7,831.80 : x
  2. Step 2: Convert to fraction form
    7,831.80/10,979.10 = 7,831.80/x
  3. Step 3: Cross multiply
    7,831.80x = 10,979.10 × 7,831.80
  4. Step 4: Simplify right side
    7,831.80x = 85,986,115.38
  5. Step 5: Solve for x
    x = 85,986,115.38/7,831.80
  6. Step 6: Final answer
    x = 10,979.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.