Home / 813,939.40-1,220,909.10-415,808.20

Finding the Fourth Proportional to 813,939.40, 1,220,909.10 and 415,808.20

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Solution

The fourth proportional to 813,939.40, 1,220,909.10 and 415,808.20 is: 623,712.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    813,939.40 : 1,220,909.10 = 415,808.20 : x
  2. Step 2: Convert to fraction form
    813,939.40/1,220,909.10 = 415,808.20/x
  3. Step 3: Cross multiply
    813,939.40x = 1,220,909.10 × 415,808.20
  4. Step 4: Simplify right side
    813,939.40x = 507,664,015,234.62
  5. Step 5: Solve for x
    x = 507,664,015,234.62/813,939.40
  6. Step 6: Final answer
    x = 623,712.30

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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.