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Finding the Fourth Proportional to 663,797.70, 915,804.59 and 391,729.50

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Solution

The fourth proportional to 663,797.70, 915,804.59 and 391,729.50 is: 540,447.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,797.70 : 915,804.59 = 391,729.50 : x
  2. Step 2: Convert to fraction form
    663,797.70/915,804.59 = 391,729.50/x
  3. Step 3: Cross multiply
    663,797.70x = 915,804.59 × 391,729.50
  4. Step 4: Simplify right side
    663,797.70x = 358,747,672,179.76
  5. Step 5: Solve for x
    x = 358,747,672,179.76/663,797.70
  6. Step 6: Final answer
    x = 540,447.30

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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.