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Finding the Fourth Proportional to 1,071.58, 1,478.37 and 629.32

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Solution

The fourth proportional to 1,071.58, 1,478.37 and 629.32 is: 868.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.58 : 1,478.37 = 629.32 : x
  2. Step 2: Convert to fraction form
    1,071.58/1,478.37 = 629.32/x
  3. Step 3: Cross multiply
    1,071.58x = 1,478.37 × 629.32
  4. Step 4: Simplify right side
    1,071.58x = 930,367.81
  5. Step 5: Solve for x
    x = 930,367.81/1,071.58
  6. Step 6: Final answer
    x = 868.22

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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.