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Finding the Fourth Proportional to 387,294.57, 534,455.82 and 215,208.09

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Solution

The fourth proportional to 387,294.57, 534,455.82 and 215,208.09 is: 296,981.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,294.57 : 534,455.82 = 215,208.09 : x
  2. Step 2: Convert to fraction form
    387,294.57/534,455.82 = 215,208.09/x
  3. Step 3: Cross multiply
    387,294.57x = 534,455.82 × 215,208.09
  4. Step 4: Simplify right side
    387,294.57x = 115,019,216,211.58
  5. Step 5: Solve for x
    x = 115,019,216,211.58/387,294.57
  6. Step 6: Final answer
    x = 296,981.23

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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.