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Finding the Fourth Proportional to 644,325.50, 889,140.40 and 386,344.84

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Solution

The fourth proportional to 644,325.50, 889,140.40 and 386,344.84 is: 533,138.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,325.50 : 889,140.40 = 386,344.84 : x
  2. Step 2: Convert to fraction form
    644,325.50/889,140.40 = 386,344.84/x
  3. Step 3: Cross multiply
    644,325.50x = 889,140.40 × 386,344.84
  4. Step 4: Simplify right side
    644,325.50x = 343,514,805,575.54
  5. Step 5: Solve for x
    x = 343,514,805,575.54/644,325.50
  6. Step 6: Final answer
    x = 533,138.62

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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.