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Finding the Fourth Proportional to 811,891.20, 1,139,136 and 811,891.20

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Solution

The fourth proportional to 811,891.20, 1,139,136 and 811,891.20 is: 1,139,136

Step by Step Solution

  1. Step 1: Write the proportion equation
    811,891.20 : 1,139,136 = 811,891.20 : x
  2. Step 2: Convert to fraction form
    811,891.20/1,139,136 = 811,891.20/x
  3. Step 3: Cross multiply
    811,891.20x = 1,139,136 × 811,891.20
  4. Step 4: Simplify right side
    811,891.20x = 924,854,494,003.20
  5. Step 5: Solve for x
    x = 924,854,494,003.20/811,891.20
  6. Step 6: Final answer
    x = 1,139,136

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.