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Finding the Fourth Proportional to 641,965, 885,900.80 and 355,478.94

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Solution

The fourth proportional to 641,965, 885,900.80 and 355,478.94 is: 490,554.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,965 : 885,900.80 = 355,478.94 : x
  2. Step 2: Convert to fraction form
    641,965/885,900.80 = 355,478.94/x
  3. Step 3: Cross multiply
    641,965x = 885,900.80 × 355,478.94
  4. Step 4: Simplify right side
    641,965x = 314,919,077,329.15
  5. Step 5: Solve for x
    x = 314,919,077,329.15/641,965
  6. Step 6: Final answer
    x = 490,554.90

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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.