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Finding the Fourth Proportional to 1,079.45, 1,489.60 and 660.50

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Solution

The fourth proportional to 1,079.45, 1,489.60 and 660.50 is: 911.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.45 : 1,489.60 = 660.50 : x
  2. Step 2: Convert to fraction form
    1,079.45/1,489.60 = 660.50/x
  3. Step 3: Cross multiply
    1,079.45x = 1,489.60 × 660.50
  4. Step 4: Simplify right side
    1,079.45x = 983,880.80
  5. Step 5: Solve for x
    x = 983,880.80/1,079.45
  6. Step 6: Final answer
    x = 911.46

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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.