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Finding the Fourth Proportional to 421,931.19, 632,816.15 and 126,443.19

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Solution

The fourth proportional to 421,931.19, 632,816.15 and 126,443.19 is: 189,640.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,931.19 : 632,816.15 = 126,443.19 : x
  2. Step 2: Convert to fraction form
    421,931.19/632,816.15 = 126,443.19/x
  3. Step 3: Cross multiply
    421,931.19x = 632,816.15 × 126,443.19
  4. Step 4: Simplify right side
    421,931.19x = 80,015,292,057.30
  5. Step 5: Solve for x
    x = 80,015,292,057.30/421,931.19
  6. Step 6: Final answer
    x = 189,640.62

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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.