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Finding the Fourth Proportional to 611,635.40, 917,453.10 and 212,143.40

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Solution

The fourth proportional to 611,635.40, 917,453.10 and 212,143.40 is: 318,215.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,635.40 : 917,453.10 = 212,143.40 : x
  2. Step 2: Convert to fraction form
    611,635.40/917,453.10 = 212,143.40/x
  3. Step 3: Cross multiply
    611,635.40x = 917,453.10 × 212,143.40
  4. Step 4: Simplify right side
    611,635.40x = 194,631,619,974.54
  5. Step 5: Solve for x
    x = 194,631,619,974.54/611,635.40
  6. Step 6: Final answer
    x = 318,215.10

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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.