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Finding the Fourth Proportional to 644,242.38, 889,066.47 and 357,789.12

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Solution

The fourth proportional to 644,242.38, 889,066.47 and 357,789.12 is: 493,755.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,242.38 : 889,066.47 = 357,789.12 : x
  2. Step 2: Convert to fraction form
    644,242.38/889,066.47 = 357,789.12/x
  3. Step 3: Cross multiply
    644,242.38x = 889,066.47 × 357,789.12
  4. Step 4: Simplify right side
    644,242.38x = 318,098,309,922.81
  5. Step 5: Solve for x
    x = 318,098,309,922.81/644,242.38
  6. Step 6: Final answer
    x = 493,755.64

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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.