Home / 428,831.20-643,246.80-262,943.20

Finding the Fourth Proportional to 428,831.20, 643,246.80 and 262,943.20

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Solution

The fourth proportional to 428,831.20, 643,246.80 and 262,943.20 is: 394,414.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,831.20 : 643,246.80 = 262,943.20 : x
  2. Step 2: Convert to fraction form
    428,831.20/643,246.80 = 262,943.20/x
  3. Step 3: Cross multiply
    428,831.20x = 643,246.80 × 262,943.20
  4. Step 4: Simplify right side
    428,831.20x = 169,137,371,981.76
  5. Step 5: Solve for x
    x = 169,137,371,981.76/428,831.20
  6. Step 6: Final answer
    x = 394,414.80

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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.