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Finding the Fourth Proportional to 296,640.63, 445,036.30 and 86,278.57

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Solution

The fourth proportional to 296,640.63, 445,036.30 and 86,278.57 is: 129,439.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    296,640.63 : 445,036.30 = 86,278.57 : x
  2. Step 2: Convert to fraction form
    296,640.63/445,036.30 = 86,278.57/x
  3. Step 3: Cross multiply
    296,640.63x = 445,036.30 × 86,278.57
  4. Step 4: Simplify right side
    296,640.63x = 38,397,095,562.09
  5. Step 5: Solve for x
    x = 38,397,095,562.09/296,640.63
  6. Step 6: Final answer
    x = 129,439.77

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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.