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Finding the Fourth Proportional to 644,990.28, 889,942.02 and 390,336

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Solution

The fourth proportional to 644,990.28, 889,942.02 and 390,336 is: 538,576.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,990.28 : 889,942.02 = 390,336 : x
  2. Step 2: Convert to fraction form
    644,990.28/889,942.02 = 390,336/x
  3. Step 3: Cross multiply
    644,990.28x = 889,942.02 × 390,336
  4. Step 4: Simplify right side
    644,990.28x = 347,376,408,318.72
  5. Step 5: Solve for x
    x = 347,376,408,318.72/644,990.28
  6. Step 6: Final answer
    x = 538,576.19

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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.