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Finding the Fourth Proportional to 811,989, 1,120,468.92 and 485,237.18

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Solution

The fourth proportional to 811,989, 1,120,468.92 and 485,237.18 is: 669,581.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    811,989 : 1,120,468.92 = 485,237.18 : x
  2. Step 2: Convert to fraction form
    811,989/1,120,468.92 = 485,237.18/x
  3. Step 3: Cross multiply
    811,989x = 1,120,468.92 × 485,237.18
  4. Step 4: Simplify right side
    811,989x = 543,693,179,018.45
  5. Step 5: Solve for x
    x = 543,693,179,018.45/811,989
  6. Step 6: Final answer
    x = 669,581.95

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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.