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Finding the Fourth Proportional to 620,720.93, 931,154.30 and 221,418.47

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Solution

The fourth proportional to 620,720.93, 931,154.30 and 221,418.47 is: 332,153.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,720.93 : 931,154.30 = 221,418.47 : x
  2. Step 2: Convert to fraction form
    620,720.93/931,154.30 = 221,418.47/x
  3. Step 3: Cross multiply
    620,720.93x = 931,154.30 × 221,418.47
  4. Step 4: Simplify right side
    620,720.93x = 206,174,760,439.92
  5. Step 5: Solve for x
    x = 206,174,760,439.92/620,720.93
  6. Step 6: Final answer
    x = 332,153.71

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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.