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Finding the Fourth Proportional to 528,831, 729,786.78 and 290,367

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Solution

The fourth proportional to 528,831, 729,786.78 and 290,367 is: 400,706.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,831 : 729,786.78 = 290,367 : x
  2. Step 2: Convert to fraction form
    528,831/729,786.78 = 290,367/x
  3. Step 3: Cross multiply
    528,831x = 729,786.78 × 290,367
  4. Step 4: Simplify right side
    528,831x = 211,905,997,948.26
  5. Step 5: Solve for x
    x = 211,905,997,948.26/528,831
  6. Step 6: Final answer
    x = 400,706.46

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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.