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Finding the Fourth Proportional to 1,390.21, 2,085.60 and 568.55

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Solution

The fourth proportional to 1,390.21, 2,085.60 and 568.55 is: 852.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.21 : 2,085.60 = 568.55 : x
  2. Step 2: Convert to fraction form
    1,390.21/2,085.60 = 568.55/x
  3. Step 3: Cross multiply
    1,390.21x = 2,085.60 × 568.55
  4. Step 4: Simplify right side
    1,390.21x = 1,185,765.04
  5. Step 5: Solve for x
    x = 1,185,765.04/1,390.21
  6. Step 6: Final answer
    x = 852.94

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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.