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Finding the Fourth Proportional to 351,803.72, 485,223.50 and 221,019.40

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Solution

The fourth proportional to 351,803.72, 485,223.50 and 221,019.40 is: 304,839.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    351,803.72 : 485,223.50 = 221,019.40 : x
  2. Step 2: Convert to fraction form
    351,803.72/485,223.50 = 221,019.40/x
  3. Step 3: Cross multiply
    351,803.72x = 485,223.50 × 221,019.40
  4. Step 4: Simplify right side
    351,803.72x = 107,243,806,835.90
  5. Step 5: Solve for x
    x = 107,243,806,835.90/351,803.72
  6. Step 6: Final answer
    x = 304,839.89

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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.