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Finding the Fourth Proportional to 5,673.90, 7,831.20 and 3,156.86

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Solution

The fourth proportional to 5,673.90, 7,831.20 and 3,156.86 is: 4,357.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,673.90 : 7,831.20 = 3,156.86 : x
  2. Step 2: Convert to fraction form
    5,673.90/7,831.20 = 3,156.86/x
  3. Step 3: Cross multiply
    5,673.90x = 7,831.20 × 3,156.86
  4. Step 4: Simplify right side
    5,673.90x = 24,722,002.03
  5. Step 5: Solve for x
    x = 24,722,002.03/5,673.90
  6. Step 6: Final answer
    x = 4,357.14

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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.