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Finding the Fourth Proportional to 1,122.03, 1,678.95 and 660.03

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Solution

The fourth proportional to 1,122.03, 1,678.95 and 660.03 is: 987.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.03 : 1,678.95 = 660.03 : x
  2. Step 2: Convert to fraction form
    1,122.03/1,678.95 = 660.03/x
  3. Step 3: Cross multiply
    1,122.03x = 1,678.95 × 660.03
  4. Step 4: Simplify right side
    1,122.03x = 1,108,157.37
  5. Step 5: Solve for x
    x = 1,108,157.37/1,122.03
  6. Step 6: Final answer
    x = 987.64

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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.