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Finding the Fourth Proportional to 1,171.48, 1,758.24 and 989.01

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Solution

The fourth proportional to 1,171.48, 1,758.24 and 989.01 is: 1,484.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,171.48 : 1,758.24 = 989.01 : x
  2. Step 2: Convert to fraction form
    1,171.48/1,758.24 = 989.01/x
  3. Step 3: Cross multiply
    1,171.48x = 1,758.24 × 989.01
  4. Step 4: Simplify right side
    1,171.48x = 1,738,916.94
  5. Step 5: Solve for x
    x = 1,738,916.94/1,171.48
  6. Step 6: Final answer
    x = 1,484.38

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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.