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Finding the Fourth Proportional to 620,632.18, 931,021.17 and 221,329.72

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Solution

The fourth proportional to 620,632.18, 931,021.17 and 221,329.72 is: 332,020.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,632.18 : 931,021.17 = 221,329.72 : x
  2. Step 2: Convert to fraction form
    620,632.18/931,021.17 = 221,329.72/x
  3. Step 3: Cross multiply
    620,632.18x = 931,021.17 × 221,329.72
  4. Step 4: Simplify right side
    620,632.18x = 206,062,654,870.17
  5. Step 5: Solve for x
    x = 206,062,654,870.17/620,632.18
  6. Step 6: Final answer
    x = 332,020.58

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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.