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Finding the Fourth Proportional to 644,538.78, 889,462.89 and 358,085.70

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Solution

The fourth proportional to 644,538.78, 889,462.89 and 358,085.70 is: 494,157.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,538.78 : 889,462.89 = 358,085.70 : x
  2. Step 2: Convert to fraction form
    644,538.78/889,462.89 = 358,085.70/x
  3. Step 3: Cross multiply
    644,538.78x = 889,462.89 × 358,085.70
  4. Step 4: Simplify right side
    644,538.78x = 318,503,941,589.67
  5. Step 5: Solve for x
    x = 318,503,941,589.67/644,538.78
  6. Step 6: Final answer
    x = 494,157.92

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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.