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Finding the Fourth Proportional to 859.67, 1,186.39 and 528.45

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Solution

The fourth proportional to 859.67, 1,186.39 and 528.45 is: 729.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.67 : 1,186.39 = 528.45 : x
  2. Step 2: Convert to fraction form
    859.67/1,186.39 = 528.45/x
  3. Step 3: Cross multiply
    859.67x = 1,186.39 × 528.45
  4. Step 4: Simplify right side
    859.67x = 626,947.80
  5. Step 5: Solve for x
    x = 626,947.80/859.67
  6. Step 6: Final answer
    x = 729.29

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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.