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Finding the Fourth Proportional to 641,856.62, 885,789.81 and 355,376.71

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Solution

The fourth proportional to 641,856.62, 885,789.81 and 355,376.71 is: 490,435.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,856.62 : 885,789.81 = 355,376.71 : x
  2. Step 2: Convert to fraction form
    641,856.62/885,789.81 = 355,376.71/x
  3. Step 3: Cross multiply
    641,856.62x = 885,789.81 × 355,376.71
  4. Step 4: Simplify right side
    641,856.62x = 314,789,064,000.38
  5. Step 5: Solve for x
    x = 314,789,064,000.38/641,856.62
  6. Step 6: Final answer
    x = 490,435.18

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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.