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Finding the Fourth Proportional to 415,902.20, 623,853.30 and 389,658.20

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Solution

The fourth proportional to 415,902.20, 623,853.30 and 389,658.20 is: 584,487.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    415,902.20 : 623,853.30 = 389,658.20 : x
  2. Step 2: Convert to fraction form
    415,902.20/623,853.30 = 389,658.20/x
  3. Step 3: Cross multiply
    415,902.20x = 623,853.30 × 389,658.20
  4. Step 4: Simplify right side
    415,902.20x = 243,089,553,942.06
  5. Step 5: Solve for x
    x = 243,089,553,942.06/415,902.20
  6. Step 6: Final answer
    x = 584,487.30

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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.