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Finding the Fourth Proportional to 385,672.79, 578,579.38 and 132,989.51

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Solution

The fourth proportional to 385,672.79, 578,579.38 and 132,989.51 is: 199,508.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,672.79 : 578,579.38 = 132,989.51 : x
  2. Step 2: Convert to fraction form
    385,672.79/578,579.38 = 132,989.51/x
  3. Step 3: Cross multiply
    385,672.79x = 578,579.38 × 132,989.51
  4. Step 4: Simplify right side
    385,672.79x = 76,944,987,128.33
  5. Step 5: Solve for x
    x = 76,944,987,128.33/385,672.79
  6. Step 6: Final answer
    x = 199,508.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.