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Finding the Fourth Proportional to 1,389.53, 2,084.29 and 556.97

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Solution

The fourth proportional to 1,389.53, 2,084.29 and 556.97 is: 835.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.53 : 2,084.29 = 556.97 : x
  2. Step 2: Convert to fraction form
    1,389.53/2,084.29 = 556.97/x
  3. Step 3: Cross multiply
    1,389.53x = 2,084.29 × 556.97
  4. Step 4: Simplify right side
    1,389.53x = 1,160,879.88
  5. Step 5: Solve for x
    x = 1,160,879.88/1,389.53
  6. Step 6: Final answer
    x = 835.45

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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.