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Finding the Fourth Proportional to 870,608.64, 1,305,765.12 and 397,182.72

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Solution

The fourth proportional to 870,608.64, 1,305,765.12 and 397,182.72 is: 595,706.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    870,608.64 : 1,305,765.12 = 397,182.72 : x
  2. Step 2: Convert to fraction form
    870,608.64/1,305,765.12 = 397,182.72/x
  3. Step 3: Cross multiply
    870,608.64x = 1,305,765.12 × 397,182.72
  4. Step 4: Simplify right side
    870,608.64x = 518,627,342,042.73
  5. Step 5: Solve for x
    x = 518,627,342,042.73/870,608.64
  6. Step 6: Final answer
    x = 595,706.63

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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.