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Finding the Fourth Proportional to 663,842.45, 915,965.28 and 388,147.21

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Solution

The fourth proportional to 663,842.45, 915,965.28 and 388,147.21 is: 535,562.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,842.45 : 915,965.28 = 388,147.21 : x
  2. Step 2: Convert to fraction form
    663,842.45/915,965.28 = 388,147.21/x
  3. Step 3: Cross multiply
    663,842.45x = 915,965.28 × 388,147.21
  4. Step 4: Simplify right side
    663,842.45x = 355,529,365,598.96
  5. Step 5: Solve for x
    x = 355,529,365,598.96/663,842.45
  6. Step 6: Final answer
    x = 535,562.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.