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Finding the Fourth Proportional to 611.21, 840.96 and 528.05

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Solution

The fourth proportional to 611.21, 840.96 and 528.05 is: 726.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.21 : 840.96 = 528.05 : x
  2. Step 2: Convert to fraction form
    611.21/840.96 = 528.05/x
  3. Step 3: Cross multiply
    611.21x = 840.96 × 528.05
  4. Step 4: Simplify right side
    611.21x = 444,064.72
  5. Step 5: Solve for x
    x = 444,064.72/611.21
  6. Step 6: Final answer
    x = 726.54

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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.