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Finding the Fourth Proportional to 456,748.80, 685,123.20 and 220,115.40

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Solution

The fourth proportional to 456,748.80, 685,123.20 and 220,115.40 is: 330,173.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    456,748.80 : 685,123.20 = 220,115.40 : x
  2. Step 2: Convert to fraction form
    456,748.80/685,123.20 = 220,115.40/x
  3. Step 3: Cross multiply
    456,748.80x = 685,123.20 × 220,115.40
  4. Step 4: Simplify right side
    456,748.80x = 150,806,167,217.28
  5. Step 5: Solve for x
    x = 150,806,167,217.28/456,748.80
  6. Step 6: Final answer
    x = 330,173.10

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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.