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Finding the Fourth Proportional to 859.90, 1,186.77 and 528.37

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Solution

The fourth proportional to 859.90, 1,186.77 and 528.37 is: 729.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.90 : 1,186.77 = 528.37 : x
  2. Step 2: Convert to fraction form
    859.90/1,186.77 = 528.37/x
  3. Step 3: Cross multiply
    859.90x = 1,186.77 × 528.37
  4. Step 4: Simplify right side
    859.90x = 627,053.66
  5. Step 5: Solve for x
    x = 627,053.66/859.90
  6. Step 6: Final answer
    x = 729.22

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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.