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Finding the Fourth Proportional to 391,703.50, 540,572.70 and 221,992.30

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Solution

The fourth proportional to 391,703.50, 540,572.70 and 221,992.30 is: 306,361.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,703.50 : 540,572.70 = 221,992.30 : x
  2. Step 2: Convert to fraction form
    391,703.50/540,572.70 = 221,992.30/x
  3. Step 3: Cross multiply
    391,703.50x = 540,572.70 × 221,992.30
  4. Step 4: Simplify right side
    391,703.50x = 120,002,976,990.21
  5. Step 5: Solve for x
    x = 120,002,976,990.21/391,703.50
  6. Step 6: Final answer
    x = 306,361.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.