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Finding the Fourth Proportional to 387,690.82, 535,016.28 and 215,611.18

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Solution

The fourth proportional to 387,690.82, 535,016.28 and 215,611.18 is: 297,545.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,690.82 : 535,016.28 = 215,611.18 : x
  2. Step 2: Convert to fraction form
    387,690.82/535,016.28 = 215,611.18/x
  3. Step 3: Cross multiply
    387,690.82x = 535,016.28 × 215,611.18
  4. Step 4: Simplify right side
    387,690.82x = 115,355,491,450.01
  5. Step 5: Solve for x
    x = 115,355,491,450.01/387,690.82
  6. Step 6: Final answer
    x = 297,545.07

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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.