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Finding the Fourth Proportional to 611,287.20, 916,930.80 and 422,330.40

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Solution

The fourth proportional to 611,287.20, 916,930.80 and 422,330.40 is: 633,495.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,287.20 : 916,930.80 = 422,330.40 : x
  2. Step 2: Convert to fraction form
    611,287.20/916,930.80 = 422,330.40/x
  3. Step 3: Cross multiply
    611,287.20x = 916,930.80 × 422,330.40
  4. Step 4: Simplify right side
    611,287.20x = 387,247,751,536.32
  5. Step 5: Solve for x
    x = 387,247,751,536.32/611,287.20
  6. Step 6: Final answer
    x = 633,495.60

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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.