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Finding the Fourth Proportional to 644,392.88, 889,237.44 and 357,931.28

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Solution

The fourth proportional to 644,392.88, 889,237.44 and 357,931.28 is: 493,931.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,392.88 : 889,237.44 = 357,931.28 : x
  2. Step 2: Convert to fraction form
    644,392.88/889,237.44 = 357,931.28/x
  3. Step 3: Cross multiply
    644,392.88x = 889,237.44 × 357,931.28
  4. Step 4: Simplify right side
    644,392.88x = 318,285,895,123.12
  5. Step 5: Solve for x
    x = 318,285,895,123.12/644,392.88
  6. Step 6: Final answer
    x = 493,931.43

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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.