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Finding the Fourth Proportional to 644,720.78, 889,675.56 and 358,231.06

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Solution

The fourth proportional to 644,720.78, 889,675.56 and 358,231.06 is: 494,337.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,720.78 : 889,675.56 = 358,231.06 : x
  2. Step 2: Convert to fraction form
    644,720.78/889,675.56 = 358,231.06/x
  3. Step 3: Cross multiply
    644,720.78x = 889,675.56 × 358,231.06
  4. Step 4: Simplify right side
    644,720.78x = 318,709,418,914.89
  5. Step 5: Solve for x
    x = 318,709,418,914.89/644,720.78
  6. Step 6: Final answer
    x = 494,337.13

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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.