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Finding the Fourth Proportional to 1,228.80, 1,696.38 and 948.42

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Solution

The fourth proportional to 1,228.80, 1,696.38 and 948.42 is: 1,309.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,228.80 : 1,696.38 = 948.42 : x
  2. Step 2: Convert to fraction form
    1,228.80/1,696.38 = 948.42/x
  3. Step 3: Cross multiply
    1,228.80x = 1,696.38 × 948.42
  4. Step 4: Simplify right side
    1,228.80x = 1,608,875.98
  5. Step 5: Solve for x
    x = 1,608,875.98/1,228.80
  6. Step 6: Final answer
    x = 1,309.31

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1.5x scale

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.