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Finding the Fourth Proportional to 382,691.37, 528,178.80 and 221,644.32

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Solution

The fourth proportional to 382,691.37, 528,178.80 and 221,644.32 is: 305,906.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    382,691.37 : 528,178.80 = 221,644.32 : x
  2. Step 2: Convert to fraction form
    382,691.37/528,178.80 = 221,644.32/x
  3. Step 3: Cross multiply
    382,691.37x = 528,178.80 × 221,644.32
  4. Step 4: Simplify right side
    382,691.37x = 117,067,830,964.42
  5. Step 5: Solve for x
    x = 117,067,830,964.42/382,691.37
  6. Step 6: Final answer
    x = 305,906.64

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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.