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Finding the Fourth Proportional to 809,345.60, 1,214,018.40 and 388,404.80

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Solution

The fourth proportional to 809,345.60, 1,214,018.40 and 388,404.80 is: 582,607.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    809,345.60 : 1,214,018.40 = 388,404.80 : x
  2. Step 2: Convert to fraction form
    809,345.60/1,214,018.40 = 388,404.80/x
  3. Step 3: Cross multiply
    809,345.60x = 1,214,018.40 × 388,404.80
  4. Step 4: Simplify right side
    809,345.60x = 471,530,573,848.32
  5. Step 5: Solve for x
    x = 471,530,573,848.32/809,345.60
  6. Step 6: Final answer
    x = 582,607.20

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.