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Finding the Fourth Proportional to 1,390.33, 2,085.77 and 513.37

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Solution

The fourth proportional to 1,390.33, 2,085.77 and 513.37 is: 770.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.33 : 2,085.77 = 513.37 : x
  2. Step 2: Convert to fraction form
    1,390.33/2,085.77 = 513.37/x
  3. Step 3: Cross multiply
    1,390.33x = 2,085.77 × 513.37
  4. Step 4: Simplify right side
    1,390.33x = 1,070,771.74
  5. Step 5: Solve for x
    x = 1,070,771.74/1,390.33
  6. Step 6: Final answer
    x = 770.16

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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.