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Finding the Fourth Proportional to 644,986.28, 889,936.52 and 390,332

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Solution

The fourth proportional to 644,986.28, 889,936.52 and 390,332 is: 538,570.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,986.28 : 889,936.52 = 390,332 : x
  2. Step 2: Convert to fraction form
    644,986.28/889,936.52 = 390,332/x
  3. Step 3: Cross multiply
    644,986.28x = 889,936.52 × 390,332
  4. Step 4: Simplify right side
    644,986.28x = 347,370,701,724.64
  5. Step 5: Solve for x
    x = 347,370,701,724.64/644,986.28
  6. Step 6: Final answer
    x = 538,570.68

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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.