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Finding the Fourth Proportional to 1,048.53, 1,447.01 and 628.74

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Solution

The fourth proportional to 1,048.53, 1,447.01 and 628.74 is: 867.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,048.53 : 1,447.01 = 628.74 : x
  2. Step 2: Convert to fraction form
    1,048.53/1,447.01 = 628.74/x
  3. Step 3: Cross multiply
    1,048.53x = 1,447.01 × 628.74
  4. Step 4: Simplify right side
    1,048.53x = 909,789.92
  5. Step 5: Solve for x
    x = 909,789.92/1,048.53
  6. Step 6: Final answer
    x = 867.68

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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.