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Finding the Fourth Proportional to 257,664.80, 386,516.40 and 91,431.20

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Solution

The fourth proportional to 257,664.80, 386,516.40 and 91,431.20 is: 137,153.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,664.80 : 386,516.40 = 91,431.20 : x
  2. Step 2: Convert to fraction form
    257,664.80/386,516.40 = 91,431.20/x
  3. Step 3: Cross multiply
    257,664.80x = 386,516.40 × 91,431.20
  4. Step 4: Simplify right side
    257,664.80x = 35,339,658,271.68
  5. Step 5: Solve for x
    x = 35,339,658,271.68/257,664.80
  6. Step 6: Final answer
    x = 137,153.61

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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.