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Finding the Fourth Proportional to 1,390.39, 2,085 and 568.12

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Solution

The fourth proportional to 1,390.39, 2,085 and 568.12 is: 851.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.39 : 2,085 = 568.12 : x
  2. Step 2: Convert to fraction form
    1,390.39/2,085 = 568.12/x
  3. Step 3: Cross multiply
    1,390.39x = 2,085 × 568.12
  4. Step 4: Simplify right side
    1,390.39x = 1,184,530.20
  5. Step 5: Solve for x
    x = 1,184,530.20/1,390.39
  6. Step 6: Final answer
    x = 851.94

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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.