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Finding the Fourth Proportional to 620,478.40, 930,717.60 and 221,569.60

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Solution

The fourth proportional to 620,478.40, 930,717.60 and 221,569.60 is: 332,354.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,478.40 : 930,717.60 = 221,569.60 : x
  2. Step 2: Convert to fraction form
    620,478.40/930,717.60 = 221,569.60/x
  3. Step 3: Cross multiply
    620,478.40x = 930,717.60 × 221,569.60
  4. Step 4: Simplify right side
    620,478.40x = 206,218,726,344.96
  5. Step 5: Solve for x
    x = 206,218,726,344.96/620,478.40
  6. Step 6: Final answer
    x = 332,354.40

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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.