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Finding the Fourth Proportional to 387,165.80, 534,201.54 and 217,388.72

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Solution

The fourth proportional to 387,165.80, 534,201.54 and 217,388.72 is: 299,947.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,165.80 : 534,201.54 = 217,388.72 : x
  2. Step 2: Convert to fraction form
    387,165.80/534,201.54 = 217,388.72/x
  3. Step 3: Cross multiply
    387,165.80x = 534,201.54 × 217,388.72
  4. Step 4: Simplify right side
    387,165.80x = 116,129,389,002.63
  5. Step 5: Solve for x
    x = 116,129,389,002.63/387,165.80
  6. Step 6: Final answer
    x = 299,947.44

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1.5x scale

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.