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Finding the Fourth Proportional to 1,318.68, 1,819.56 and 875.81

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Solution

The fourth proportional to 1,318.68, 1,819.56 and 875.81 is: 1,208.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.68 : 1,819.56 = 875.81 : x
  2. Step 2: Convert to fraction form
    1,318.68/1,819.56 = 875.81/x
  3. Step 3: Cross multiply
    1,318.68x = 1,819.56 × 875.81
  4. Step 4: Simplify right side
    1,318.68x = 1,593,596.68
  5. Step 5: Solve for x
    x = 1,593,596.68/1,318.68
  6. Step 6: Final answer
    x = 1,208.48

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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.