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Finding the Fourth Proportional to 804,703.40, 1,207,055.10 and 405,189.80

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Solution

The fourth proportional to 804,703.40, 1,207,055.10 and 405,189.80 is: 607,784.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    804,703.40 : 1,207,055.10 = 405,189.80 : x
  2. Step 2: Convert to fraction form
    804,703.40/1,207,055.10 = 405,189.80/x
  3. Step 3: Cross multiply
    804,703.40x = 1,207,055.10 × 405,189.80
  4. Step 4: Simplify right side
    804,703.40x = 489,086,414,557.98
  5. Step 5: Solve for x
    x = 489,086,414,557.98/804,703.40
  6. Step 6: Final answer
    x = 607,784.70

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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.