Home / 813,905.40-1,220,858.10-415,774.20

Finding the Fourth Proportional to 813,905.40, 1,220,858.10 and 415,774.20

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Solution

The fourth proportional to 813,905.40, 1,220,858.10 and 415,774.20 is: 623,661.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    813,905.40 : 1,220,858.10 = 415,774.20 : x
  2. Step 2: Convert to fraction form
    813,905.40/1,220,858.10 = 415,774.20/x
  3. Step 3: Cross multiply
    813,905.40x = 1,220,858.10 × 415,774.20
  4. Step 4: Simplify right side
    813,905.40x = 507,601,299,841.02
  5. Step 5: Solve for x
    x = 507,601,299,841.02/813,905.40
  6. Step 6: Final answer
    x = 623,661.30

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