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Finding the Fourth Proportional to 421,981.12, 632,992.11 and 137,671.12

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Solution

The fourth proportional to 421,981.12, 632,992.11 and 137,671.12 is: 206,513.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,981.12 : 632,992.11 = 137,671.12 : x
  2. Step 2: Convert to fraction form
    421,981.12/632,992.11 = 137,671.12/x
  3. Step 3: Cross multiply
    421,981.12x = 632,992.11 × 137,671.12
  4. Step 4: Simplify right side
    421,981.12x = 87,144,732,734.86
  5. Step 5: Solve for x
    x = 87,144,732,734.86/421,981.12
  6. Step 6: Final answer
    x = 206,513.35

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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.