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Finding the Fourth Proportional to 387,730.86, 535,027.78 and 215,620.94

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Solution

The fourth proportional to 387,730.86, 535,027.78 and 215,620.94 is: 297,534.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,730.86 : 535,027.78 = 215,620.94 : x
  2. Step 2: Convert to fraction form
    387,730.86/535,027.78 = 215,620.94/x
  3. Step 3: Cross multiply
    387,730.86x = 535,027.78 × 215,620.94
  4. Step 4: Simplify right side
    387,730.86x = 115,363,192,849.71
  5. Step 5: Solve for x
    x = 115,363,192,849.71/387,730.86
  6. Step 6: Final answer
    x = 297,534.20

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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.