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Finding the Fourth Proportional to 611,087.55, 843,288.13 and 339,139.63

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Solution

The fourth proportional to 611,087.55, 843,288.13 and 339,139.63 is: 468,005.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,087.55 : 843,288.13 = 339,139.63 : x
  2. Step 2: Convert to fraction form
    611,087.55/843,288.13 = 339,139.63/x
  3. Step 3: Cross multiply
    611,087.55x = 843,288.13 × 339,139.63
  4. Step 4: Simplify right side
    611,087.55x = 285,992,424,391.59
  5. Step 5: Solve for x
    x = 285,992,424,391.59/611,087.55
  6. Step 6: Final answer
    x = 468,005.65

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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.