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Finding the Fourth Proportional to 644,984.28, 889,933.77 and 390,330

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Solution

The fourth proportional to 644,984.28, 889,933.77 and 390,330 is: 538,567.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,984.28 : 889,933.77 = 390,330 : x
  2. Step 2: Convert to fraction form
    644,984.28/889,933.77 = 390,330/x
  3. Step 3: Cross multiply
    644,984.28x = 889,933.77 × 390,330
  4. Step 4: Simplify right side
    644,984.28x = 347,367,848,444.10
  5. Step 5: Solve for x
    x = 347,367,848,444.10/644,984.28
  6. Step 6: Final answer
    x = 538,567.93

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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.