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Finding the Fourth Proportional to 641,490.60, 885,284.84 and 355,010.80

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Solution

The fourth proportional to 641,490.60, 885,284.84 and 355,010.80 is: 489,930.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,490.60 : 885,284.84 = 355,010.80 : x
  2. Step 2: Convert to fraction form
    641,490.60/885,284.84 = 355,010.80/x
  3. Step 3: Cross multiply
    641,490.60x = 885,284.84 × 355,010.80
  4. Step 4: Simplify right side
    641,490.60x = 314,285,679,276.27
  5. Step 5: Solve for x
    x = 314,285,679,276.27/641,490.60
  6. Step 6: Final answer
    x = 489,930.30

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Double scale
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Similar ratio
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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.