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Finding the Fourth Proportional to 1,389.48, 2,085.62 and 696.65

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Solution

The fourth proportional to 1,389.48, 2,085.62 and 696.65 is: 1,045.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.48 : 2,085.62 = 696.65 : x
  2. Step 2: Convert to fraction form
    1,389.48/2,085.62 = 696.65/x
  3. Step 3: Cross multiply
    1,389.48x = 2,085.62 × 696.65
  4. Step 4: Simplify right side
    1,389.48x = 1,452,933.26
  5. Step 5: Solve for x
    x = 1,452,933.26/1,389.48
  6. Step 6: Final answer
    x = 1,045.67

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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.