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Finding the Fourth Proportional to 421,455.80, 632,183.70 and 418,831.40

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Solution

The fourth proportional to 421,455.80, 632,183.70 and 418,831.40 is: 628,247.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,455.80 : 632,183.70 = 418,831.40 : x
  2. Step 2: Convert to fraction form
    421,455.80/632,183.70 = 418,831.40/x
  3. Step 3: Cross multiply
    421,455.80x = 632,183.70 × 418,831.40
  4. Step 4: Simplify right side
    421,455.80x = 264,778,384,128.18
  5. Step 5: Solve for x
    x = 264,778,384,128.18/421,455.80
  6. Step 6: Final answer
    x = 628,247.10

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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.