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Finding the Fourth Proportional to 387,856.54, 535,176.78 and 215,751.79

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Solution

The fourth proportional to 387,856.54, 535,176.78 and 215,751.79 is: 297,701.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,856.54 : 535,176.78 = 215,751.79 : x
  2. Step 2: Convert to fraction form
    387,856.54/535,176.78 = 215,751.79/x
  3. Step 3: Cross multiply
    387,856.54x = 535,176.78 × 215,751.79
  4. Step 4: Simplify right side
    387,856.54x = 115,465,348,251.44
  5. Step 5: Solve for x
    x = 115,465,348,251.44/387,856.54
  6. Step 6: Final answer
    x = 297,701.18

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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.