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Finding the Fourth Proportional to 620,438.16, 930,620.28 and 221,057.76

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Solution

The fourth proportional to 620,438.16, 930,620.28 and 221,057.76 is: 331,573.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,438.16 : 930,620.28 = 221,057.76 : x
  2. Step 2: Convert to fraction form
    620,438.16/930,620.28 = 221,057.76/x
  3. Step 3: Cross multiply
    620,438.16x = 930,620.28 × 221,057.76
  4. Step 4: Simplify right side
    620,438.16x = 205,720,834,507.37
  5. Step 5: Solve for x
    x = 205,720,834,507.37/620,438.16
  6. Step 6: Final answer
    x = 331,573.47

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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.