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Finding the Fourth Proportional to 890,442.90, 1,228,996.83 and 818,709.30

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Solution

The fourth proportional to 890,442.90, 1,228,996.83 and 818,709.30 is: 1,129,989.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    890,442.90 : 1,228,996.83 = 818,709.30 : x
  2. Step 2: Convert to fraction form
    890,442.90/1,228,996.83 = 818,709.30/x
  3. Step 3: Cross multiply
    890,442.90x = 1,228,996.83 × 818,709.30
  4. Step 4: Simplify right side
    890,442.90x = 1,006,191,134,391.52
  5. Step 5: Solve for x
    x = 1,006,191,134,391.52/890,442.90
  6. Step 6: Final answer
    x = 1,129,989.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.