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Finding the Fourth Proportional to 957.60, 1,439.10 and 838.80

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Solution

The fourth proportional to 957.60, 1,439.10 and 838.80 is: 1,260.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    957.60 : 1,439.10 = 838.80 : x
  2. Step 2: Convert to fraction form
    957.60/1,439.10 = 838.80/x
  3. Step 3: Cross multiply
    957.60x = 1,439.10 × 838.80
  4. Step 4: Simplify right side
    957.60x = 1,207,117.08
  5. Step 5: Solve for x
    x = 1,207,117.08/957.60
  6. Step 6: Final answer
    x = 1,260.57

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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.