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Finding the Fourth Proportional to 1,223.52, 1,688.68 and 989.02

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Solution

The fourth proportional to 1,223.52, 1,688.68 and 989.02 is: 1,365.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.52 : 1,688.68 = 989.02 : x
  2. Step 2: Convert to fraction form
    1,223.52/1,688.68 = 989.02/x
  3. Step 3: Cross multiply
    1,223.52x = 1,688.68 × 989.02
  4. Step 4: Simplify right side
    1,223.52x = 1,670,138.29
  5. Step 5: Solve for x
    x = 1,670,138.29/1,223.52
  6. Step 6: Final answer
    x = 1,365.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.