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Finding the Fourth Proportional to 644,759.59, 889,850.06 and 390,112.87

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Solution

The fourth proportional to 644,759.59, 889,850.06 and 390,112.87 is: 538,405.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,759.59 : 889,850.06 = 390,112.87 : x
  2. Step 2: Convert to fraction form
    644,759.59/889,850.06 = 390,112.87/x
  3. Step 3: Cross multiply
    644,759.59x = 889,850.06 × 390,112.87
  4. Step 4: Simplify right side
    644,759.59x = 347,141,960,776.27
  5. Step 5: Solve for x
    x = 347,141,960,776.27/644,759.59
  6. Step 6: Final answer
    x = 538,405.27

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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.