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Finding the Fourth Proportional to 390,136.75, 538,388.72 and 211,288.75

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Solution

The fourth proportional to 390,136.75, 538,388.72 and 211,288.75 is: 291,578.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,136.75 : 538,388.72 = 211,288.75 : x
  2. Step 2: Convert to fraction form
    390,136.75/538,388.72 = 211,288.75/x
  3. Step 3: Cross multiply
    390,136.75x = 538,388.72 × 211,288.75
  4. Step 4: Simplify right side
    390,136.75x = 113,755,479,662.90
  5. Step 5: Solve for x
    x = 113,755,479,662.90/390,136.75
  6. Step 6: Final answer
    x = 291,578.48

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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.