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Finding the Fourth Proportional to 1,071.90, 1,478.95 and 629.71

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Solution

The fourth proportional to 1,071.90, 1,478.95 and 629.71 is: 868.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.90 : 1,478.95 = 629.71 : x
  2. Step 2: Convert to fraction form
    1,071.90/1,478.95 = 629.71/x
  3. Step 3: Cross multiply
    1,071.90x = 1,478.95 × 629.71
  4. Step 4: Simplify right side
    1,071.90x = 931,306.46
  5. Step 5: Solve for x
    x = 931,306.46/1,071.90
  6. Step 6: Final answer
    x = 868.84

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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.