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Finding the Fourth Proportional to 1,210.68, 1,813.39 and 748.58

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Solution

The fourth proportional to 1,210.68, 1,813.39 and 748.58 is: 1,121.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.68 : 1,813.39 = 748.58 : x
  2. Step 2: Convert to fraction form
    1,210.68/1,813.39 = 748.58/x
  3. Step 3: Cross multiply
    1,210.68x = 1,813.39 × 748.58
  4. Step 4: Simplify right side
    1,210.68x = 1,357,456.55
  5. Step 5: Solve for x
    x = 1,357,456.55/1,210.68
  6. Step 6: Final answer
    x = 1,121.23

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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.