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Finding the Fourth Proportional to 426,831.40, 639,404.70 and 216,620.20

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Solution

The fourth proportional to 426,831.40, 639,404.70 and 216,620.20 is: 324,502.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,831.40 : 639,404.70 = 216,620.20 : x
  2. Step 2: Convert to fraction form
    426,831.40/639,404.70 = 216,620.20/x
  3. Step 3: Cross multiply
    426,831.40x = 639,404.70 × 216,620.20
  4. Step 4: Simplify right side
    426,831.40x = 138,507,973,994.94
  5. Step 5: Solve for x
    x = 138,507,973,994.94/426,831.40
  6. Step 6: Final answer
    x = 324,502.78

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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.