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Finding the Fourth Proportional to 1,358.66, 2,039.21 and 628.65

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Solution

The fourth proportional to 1,358.66, 2,039.21 and 628.65 is: 943.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,358.66 : 2,039.21 = 628.65 : x
  2. Step 2: Convert to fraction form
    1,358.66/2,039.21 = 628.65/x
  3. Step 3: Cross multiply
    1,358.66x = 2,039.21 × 628.65
  4. Step 4: Simplify right side
    1,358.66x = 1,281,946.22
  5. Step 5: Solve for x
    x = 1,281,946.22/1,358.66
  6. Step 6: Final answer
    x = 943.54

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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.