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Finding the Fourth Proportional to 644,327.76, 889,143.54 and 386,347.10

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Solution

The fourth proportional to 644,327.76, 889,143.54 and 386,347.10 is: 533,141.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,327.76 : 889,143.54 = 386,347.10 : x
  2. Step 2: Convert to fraction form
    644,327.76/889,143.54 = 386,347.10/x
  3. Step 3: Cross multiply
    644,327.76x = 889,143.54 × 386,347.10
  4. Step 4: Simplify right side
    644,327.76x = 343,518,028,162.73
  5. Step 5: Solve for x
    x = 343,518,028,162.73/644,327.76
  6. Step 6: Final answer
    x = 533,141.75

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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.