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Finding the Fourth Proportional to 1,389.69, 2,083.93 and 556.50

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Solution

The fourth proportional to 1,389.69, 2,083.93 and 556.50 is: 834.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.69 : 2,083.93 = 556.50 : x
  2. Step 2: Convert to fraction form
    1,389.69/2,083.93 = 556.50/x
  3. Step 3: Cross multiply
    1,389.69x = 2,083.93 × 556.50
  4. Step 4: Simplify right side
    1,389.69x = 1,159,704.26
  5. Step 5: Solve for x
    x = 1,159,704.26/1,389.69
  6. Step 6: Final answer
    x = 834.51

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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.