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Finding the Fourth Proportional to 391,640.50, 540,464.43 and 221,886.10

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Solution

The fourth proportional to 391,640.50, 540,464.43 and 221,886.10 is: 306,203.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,640.50 : 540,464.43 = 221,886.10 : x
  2. Step 2: Convert to fraction form
    391,640.50/540,464.43 = 221,886.10/x
  3. Step 3: Cross multiply
    391,640.50x = 540,464.43 × 221,886.10
  4. Step 4: Simplify right side
    391,640.50x = 119,921,544,561.42
  5. Step 5: Solve for x
    x = 119,921,544,561.42/391,640.50
  6. Step 6: Final answer
    x = 306,203.12

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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.