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Finding the Fourth Proportional to 644,758.84, 889,849.02 and 390,112.12

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Solution

The fourth proportional to 644,758.84, 889,849.02 and 390,112.12 is: 538,404.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,758.84 : 889,849.02 = 390,112.12 : x
  2. Step 2: Convert to fraction form
    644,758.84/889,849.02 = 390,112.12/x
  3. Step 3: Cross multiply
    644,758.84x = 889,849.02 × 390,112.12
  4. Step 4: Simplify right side
    644,758.84x = 347,140,887,672.12
  5. Step 5: Solve for x
    x = 347,140,887,672.12/644,758.84
  6. Step 6: Final answer
    x = 538,404.23

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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.