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Finding the Fourth Proportional to 644,636.64, 889,871.31 and 435,129.96

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Solution

The fourth proportional to 644,636.64, 889,871.31 and 435,129.96 is: 600,663.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,636.64 : 889,871.31 = 435,129.96 : x
  2. Step 2: Convert to fraction form
    644,636.64/889,871.31 = 435,129.96/x
  3. Step 3: Cross multiply
    644,636.64x = 889,871.31 × 435,129.96
  4. Step 4: Simplify right side
    644,636.64x = 387,209,667,525.45
  5. Step 5: Solve for x
    x = 387,209,667,525.45/644,636.64
  6. Step 6: Final answer
    x = 600,663.45

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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.