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Finding the Fourth Proportional to 644,392.64, 889,261.92 and 357,939.36

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Solution

The fourth proportional to 644,392.64, 889,261.92 and 357,939.36 is: 493,956.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,392.64 : 889,261.92 = 357,939.36 : x
  2. Step 2: Convert to fraction form
    644,392.64/889,261.92 = 357,939.36/x
  3. Step 3: Cross multiply
    644,392.64x = 889,261.92 × 357,939.36
  4. Step 4: Simplify right side
    644,392.64x = 318,301,842,517.17
  5. Step 5: Solve for x
    x = 318,301,842,517.17/644,392.64
  6. Step 6: Final answer
    x = 493,956.36

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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.