Home / 811,904.30-1,217,856.45-212,864.30

Finding the Fourth Proportional to 811,904.30, 1,217,856.45 and 212,864.30

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Solution

The fourth proportional to 811,904.30, 1,217,856.45 and 212,864.30 is: 319,296.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    811,904.30 : 1,217,856.45 = 212,864.30 : x
  2. Step 2: Convert to fraction form
    811,904.30/1,217,856.45 = 212,864.30/x
  3. Step 3: Cross multiply
    811,904.30x = 1,217,856.45 × 212,864.30
  4. Step 4: Simplify right side
    811,904.30x = 259,238,160,729.74
  5. Step 5: Solve for x
    x = 259,238,160,729.74/811,904.30
  6. Step 6: Final answer
    x = 319,296.45

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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.