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Finding the Fourth Proportional to 611,307.90, 916,961.85 and 211,815.90

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Solution

The fourth proportional to 611,307.90, 916,961.85 and 211,815.90 is: 317,723.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,307.90 : 916,961.85 = 211,815.90 : x
  2. Step 2: Convert to fraction form
    611,307.90/916,961.85 = 211,815.90/x
  3. Step 3: Cross multiply
    611,307.90x = 916,961.85 × 211,815.90
  4. Step 4: Simplify right side
    611,307.90x = 194,227,099,523.42
  5. Step 5: Solve for x
    x = 194,227,099,523.42/611,307.90
  6. Step 6: Final answer
    x = 317,723.85

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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.