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Finding the Fourth Proportional to 810,011.20, 1,215,016.80 and 573,620.80

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Solution

The fourth proportional to 810,011.20, 1,215,016.80 and 573,620.80 is: 860,431.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    810,011.20 : 1,215,016.80 = 573,620.80 : x
  2. Step 2: Convert to fraction form
    810,011.20/1,215,016.80 = 573,620.80/x
  3. Step 3: Cross multiply
    810,011.20x = 1,215,016.80 × 573,620.80
  4. Step 4: Simplify right side
    810,011.20x = 696,958,908,829.44
  5. Step 5: Solve for x
    x = 696,958,908,829.44/810,011.20
  6. Step 6: Final answer
    x = 860,431.20

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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.