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Finding the Fourth Proportional to 641,862.70, 885,798.20 and 355,382.78

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Solution

The fourth proportional to 641,862.70, 885,798.20 and 355,382.78 is: 490,443.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,862.70 : 885,798.20 = 355,382.78 : x
  2. Step 2: Convert to fraction form
    641,862.70/885,798.20 = 355,382.78/x
  3. Step 3: Cross multiply
    641,862.70x = 885,798.20 × 355,382.78
  4. Step 4: Simplify right side
    641,862.70x = 314,797,426,835.00
  5. Step 5: Solve for x
    x = 314,797,426,835.00/641,862.70
  6. Step 6: Final answer
    x = 490,443.56

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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.