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Finding the Fourth Proportional to 525.60, 788.40 and 140.85

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Solution

The fourth proportional to 525.60, 788.40 and 140.85 is: 211.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    525.60 : 788.40 = 140.85 : x
  2. Step 2: Convert to fraction form
    525.60/788.40 = 140.85/x
  3. Step 3: Cross multiply
    525.60x = 788.40 × 140.85
  4. Step 4: Simplify right side
    525.60x = 111,046.14
  5. Step 5: Solve for x
    x = 111,046.14/525.60
  6. Step 6: Final answer
    x = 211.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.