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Finding the Fourth Proportional to 644,371.32, 889,207.80 and 357,909.78

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Solution

The fourth proportional to 644,371.32, 889,207.80 and 357,909.78 is: 493,901.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,371.32 : 889,207.80 = 357,909.78 : x
  2. Step 2: Convert to fraction form
    644,371.32/889,207.80 = 357,909.78/x
  3. Step 3: Cross multiply
    644,371.32x = 889,207.80 × 357,909.78
  4. Step 4: Simplify right side
    644,371.32x = 318,256,168,072.28
  5. Step 5: Solve for x
    x = 318,256,168,072.28/644,371.32
  6. Step 6: Final answer
    x = 493,901.82

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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.