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Finding the Fourth Proportional to 644,372.32, 889,209.20 and 357,910.78

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Solution

The fourth proportional to 644,372.32, 889,209.20 and 357,910.78 is: 493,903.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,372.32 : 889,209.20 = 357,910.78 : x
  2. Step 2: Convert to fraction form
    644,372.32/889,209.20 = 357,910.78/x
  3. Step 3: Cross multiply
    644,372.32x = 889,209.20 × 357,910.78
  4. Step 4: Simplify right side
    644,372.32x = 318,257,558,355.18
  5. Step 5: Solve for x
    x = 318,257,558,355.18/644,372.32
  6. Step 6: Final answer
    x = 493,903.21

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1.5x scale

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.