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Finding the Fourth Proportional to 669,920.60, 1,004,880.90 and 220,710.80

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Solution

The fourth proportional to 669,920.60, 1,004,880.90 and 220,710.80 is: 331,066.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    669,920.60 : 1,004,880.90 = 220,710.80 : x
  2. Step 2: Convert to fraction form
    669,920.60/1,004,880.90 = 220,710.80/x
  3. Step 3: Cross multiply
    669,920.60x = 1,004,880.90 × 220,710.80
  4. Step 4: Simplify right side
    669,920.60x = 221,788,067,343.72
  5. Step 5: Solve for x
    x = 221,788,067,343.72/669,920.60
  6. Step 6: Final answer
    x = 331,066.20

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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.