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Finding the Fourth Proportional to 811,921.90, 1,138,556.90 and 811,921.90

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Solution

The fourth proportional to 811,921.90, 1,138,556.90 and 811,921.90 is: 1,138,556.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    811,921.90 : 1,138,556.90 = 811,921.90 : x
  2. Step 2: Convert to fraction form
    811,921.90/1,138,556.90 = 811,921.90/x
  3. Step 3: Cross multiply
    811,921.90x = 1,138,556.90 × 811,921.90
  4. Step 4: Simplify right side
    811,921.90x = 924,419,281,506.11
  5. Step 5: Solve for x
    x = 924,419,281,506.11/811,921.90
  6. Step 6: Final answer
    x = 1,138,556.90

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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.