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Finding the Fourth Proportional to 391,639.50, 540,463.05 and 221,885.10

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Solution

The fourth proportional to 391,639.50, 540,463.05 and 221,885.10 is: 306,201.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,639.50 : 540,463.05 = 221,885.10 : x
  2. Step 2: Convert to fraction form
    391,639.50/540,463.05 = 221,885.10/x
  3. Step 3: Cross multiply
    391,639.50x = 540,463.05 × 221,885.10
  4. Step 4: Simplify right side
    391,639.50x = 119,920,697,895.56
  5. Step 5: Solve for x
    x = 119,920,697,895.56/391,639.50
  6. Step 6: Final answer
    x = 306,201.74

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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.