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Finding the Fourth Proportional to 643,457.97, 887,900.81 and 356,906.61

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Solution

The fourth proportional to 643,457.97, 887,900.81 and 356,906.61 is: 492,491.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,457.97 : 887,900.81 = 356,906.61 : x
  2. Step 2: Convert to fraction form
    643,457.97/887,900.81 = 356,906.61/x
  3. Step 3: Cross multiply
    643,457.97x = 887,900.81 × 356,906.61
  4. Step 4: Simplify right side
    643,457.97x = 316,897,666,328.82
  5. Step 5: Solve for x
    x = 316,897,666,328.82/643,457.97
  6. Step 6: Final answer
    x = 492,491.63

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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.