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Finding the Fourth Proportional to 289,505.49, 399,634.79 and 187,618.42

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Solution

The fourth proportional to 289,505.49, 399,634.79 and 187,618.42 is: 258,989.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,505.49 : 399,634.79 = 187,618.42 : x
  2. Step 2: Convert to fraction form
    289,505.49/399,634.79 = 187,618.42/x
  3. Step 3: Cross multiply
    289,505.49x = 399,634.79 × 187,618.42
  4. Step 4: Simplify right side
    289,505.49x = 74,978,847,876.83
  5. Step 5: Solve for x
    x = 74,978,847,876.83/289,505.49
  6. Step 6: Final answer
    x = 258,989.38

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1.5x scale

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.