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Finding the Fourth Proportional to 811,990.80, 1,217,898.70 and 213,012

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Solution

The fourth proportional to 811,990.80, 1,217,898.70 and 213,012 is: 319,495.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    811,990.80 : 1,217,898.70 = 213,012 : x
  2. Step 2: Convert to fraction form
    811,990.80/1,217,898.70 = 213,012/x
  3. Step 3: Cross multiply
    811,990.80x = 1,217,898.70 × 213,012
  4. Step 4: Simplify right side
    811,990.80x = 259,427,037,884.40
  5. Step 5: Solve for x
    x = 259,427,037,884.40/811,990.80
  6. Step 6: Final answer
    x = 319,495.05

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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.