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Finding the Fourth Proportional to 387,392.67, 534,615.57 and 215,314.05

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Solution

The fourth proportional to 387,392.67, 534,615.57 and 215,314.05 is: 297,141.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,392.67 : 534,615.57 = 215,314.05 : x
  2. Step 2: Convert to fraction form
    387,392.67/534,615.57 = 215,314.05/x
  3. Step 3: Cross multiply
    387,392.67x = 534,615.57 × 215,314.05
  4. Step 4: Simplify right side
    387,392.67x = 115,110,243,569.76
  5. Step 5: Solve for x
    x = 115,110,243,569.76/387,392.67
  6. Step 6: Final answer
    x = 297,141.00

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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.