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Finding the Fourth Proportional to 1,071.66, 1,478.90 and 629.57

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Solution

The fourth proportional to 1,071.66, 1,478.90 and 629.57 is: 868.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.66 : 1,478.90 = 629.57 : x
  2. Step 2: Convert to fraction form
    1,071.66/1,478.90 = 629.57/x
  3. Step 3: Cross multiply
    1,071.66x = 1,478.90 × 629.57
  4. Step 4: Simplify right side
    1,071.66x = 931,071.07
  5. Step 5: Solve for x
    x = 931,071.07/1,071.66
  6. Step 6: Final answer
    x = 868.81

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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.