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Finding the Fourth Proportional to 1,210.75, 1,816.13 and 298.75

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Solution

The fourth proportional to 1,210.75, 1,816.13 and 298.75 is: 448.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.75 : 1,816.13 = 298.75 : x
  2. Step 2: Convert to fraction form
    1,210.75/1,816.13 = 298.75/x
  3. Step 3: Cross multiply
    1,210.75x = 1,816.13 × 298.75
  4. Step 4: Simplify right side
    1,210.75x = 542,568.84
  5. Step 5: Solve for x
    x = 542,568.84/1,210.75
  6. Step 6: Final answer
    x = 448.13

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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.