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Finding the Fourth Proportional to 620,428.56, 930,829.68 and 221,017.20

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Solution

The fourth proportional to 620,428.56, 930,829.68 and 221,017.20 is: 331,592.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,428.56 : 930,829.68 = 221,017.20 : x
  2. Step 2: Convert to fraction form
    620,428.56/930,829.68 = 221,017.20/x
  3. Step 3: Cross multiply
    620,428.56x = 930,829.68 × 221,017.20
  4. Step 4: Simplify right side
    620,428.56x = 205,729,369,550.50
  5. Step 5: Solve for x
    x = 205,729,369,550.50/620,428.56
  6. Step 6: Final answer
    x = 331,592.36

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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.