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Finding the Fourth Proportional to 860.90, 1,188.61 and 529.90

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Solution

The fourth proportional to 860.90, 1,188.61 and 529.90 is: 731.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.90 : 1,188.61 = 529.90 : x
  2. Step 2: Convert to fraction form
    860.90/1,188.61 = 529.90/x
  3. Step 3: Cross multiply
    860.90x = 1,188.61 × 529.90
  4. Step 4: Simplify right side
    860.90x = 629,840.14
  5. Step 5: Solve for x
    x = 629,840.14/860.90
  6. Step 6: Final answer
    x = 731.61

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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.