Home / 811,239.40-1,216,859.10-212,199.40

Finding the Fourth Proportional to 811,239.40, 1,216,859.10 and 212,199.40

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Solution

The fourth proportional to 811,239.40, 1,216,859.10 and 212,199.40 is: 318,299.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    811,239.40 : 1,216,859.10 = 212,199.40 : x
  2. Step 2: Convert to fraction form
    811,239.40/1,216,859.10 = 212,199.40/x
  3. Step 3: Cross multiply
    811,239.40x = 1,216,859.10 × 212,199.40
  4. Step 4: Simplify right side
    811,239.40x = 258,216,770,904.54
  5. Step 5: Solve for x
    x = 258,216,770,904.54/811,239.40
  6. Step 6: Final answer
    x = 318,299.10

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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.