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Finding the Fourth Proportional to 620,964.60, 931,446.90 and 408,388.20

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Solution

The fourth proportional to 620,964.60, 931,446.90 and 408,388.20 is: 612,582.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,964.60 : 931,446.90 = 408,388.20 : x
  2. Step 2: Convert to fraction form
    620,964.60/931,446.90 = 408,388.20/x
  3. Step 3: Cross multiply
    620,964.60x = 931,446.90 × 408,388.20
  4. Step 4: Simplify right side
    620,964.60x = 380,391,922,886.58
  5. Step 5: Solve for x
    x = 380,391,922,886.58/620,964.60
  6. Step 6: Final answer
    x = 612,582.30

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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.