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Finding the Fourth Proportional to 1,390.58, 2,085.49 and 696.74

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Solution

The fourth proportional to 1,390.58, 2,085.49 and 696.74 is: 1,044.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.58 : 2,085.49 = 696.74 : x
  2. Step 2: Convert to fraction form
    1,390.58/2,085.49 = 696.74/x
  3. Step 3: Cross multiply
    1,390.58x = 2,085.49 × 696.74
  4. Step 4: Simplify right side
    1,390.58x = 1,453,034.75
  5. Step 5: Solve for x
    x = 1,453,034.75/1,390.58
  6. Step 6: Final answer
    x = 1,044.91

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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.