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Finding the Fourth Proportional to 641,647.20, 885,480.96 and 355,193.76

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Solution

The fourth proportional to 641,647.20, 885,480.96 and 355,193.76 is: 490,171.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,647.20 : 885,480.96 = 355,193.76 : x
  2. Step 2: Convert to fraction form
    641,647.20/885,480.96 = 355,193.76/x
  3. Step 3: Cross multiply
    641,647.20x = 885,480.96 × 355,193.76
  4. Step 4: Simplify right side
    641,647.20x = 314,517,311,590.81
  5. Step 5: Solve for x
    x = 314,517,311,590.81/641,647.20
  6. Step 6: Final answer
    x = 490,171.72

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1.5x scale

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.