Home / 811,385.20-1,217,077.80-220,409.20

Finding the Fourth Proportional to 811,385.20, 1,217,077.80 and 220,409.20

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Solution

The fourth proportional to 811,385.20, 1,217,077.80 and 220,409.20 is: 330,613.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    811,385.20 : 1,217,077.80 = 220,409.20 : x
  2. Step 2: Convert to fraction form
    811,385.20/1,217,077.80 = 220,409.20/x
  3. Step 3: Cross multiply
    811,385.20x = 1,217,077.80 × 220,409.20
  4. Step 4: Simplify right side
    811,385.20x = 268,255,144,235.76
  5. Step 5: Solve for x
    x = 268,255,144,235.76/811,385.20
  6. Step 6: Final answer
    x = 330,613.80

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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.