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Finding the Fourth Proportional to 617,921.20, 926,881.80 and 428,964.40

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Solution

The fourth proportional to 617,921.20, 926,881.80 and 428,964.40 is: 643,446.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    617,921.20 : 926,881.80 = 428,964.40 : x
  2. Step 2: Convert to fraction form
    617,921.20/926,881.80 = 428,964.40/x
  3. Step 3: Cross multiply
    617,921.20x = 926,881.80 × 428,964.40
  4. Step 4: Simplify right side
    617,921.20x = 397,599,295,207.92
  5. Step 5: Solve for x
    x = 397,599,295,207.92/617,921.20
  6. Step 6: Final answer
    x = 643,446.60

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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.