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Finding the Fourth Proportional to 644,892.21, 889,988.06 and 358,430.45

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Solution

The fourth proportional to 644,892.21, 889,988.06 and 358,430.45 is: 494,654.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,892.21 : 889,988.06 = 358,430.45 : x
  2. Step 2: Convert to fraction form
    644,892.21/889,988.06 = 358,430.45/x
  3. Step 3: Cross multiply
    644,892.21x = 889,988.06 × 358,430.45
  4. Step 4: Simplify right side
    644,892.21x = 318,998,817,286.56
  5. Step 5: Solve for x
    x = 318,998,817,286.56/644,892.21
  6. Step 6: Final answer
    x = 494,654.47

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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.