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Finding the Fourth Proportional to 641,874.30, 885,814.23 and 355,394.40

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Solution

The fourth proportional to 641,874.30, 885,814.23 and 355,394.40 is: 490,459.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,874.30 : 885,814.23 = 355,394.40 : x
  2. Step 2: Convert to fraction form
    641,874.30/885,814.23 = 355,394.40/x
  3. Step 3: Cross multiply
    641,874.30x = 885,814.23 × 355,394.40
  4. Step 4: Simplify right side
    641,874.30x = 314,813,416,782.31
  5. Step 5: Solve for x
    x = 314,813,416,782.31/641,874.30
  6. Step 6: Final answer
    x = 490,459.61

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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.