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Finding the Fourth Proportional to 1,071, 1,478.07 and 677.88

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Solution

The fourth proportional to 1,071, 1,478.07 and 677.88 is: 935.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071 : 1,478.07 = 677.88 : x
  2. Step 2: Convert to fraction form
    1,071/1,478.07 = 677.88/x
  3. Step 3: Cross multiply
    1,071x = 1,478.07 × 677.88
  4. Step 4: Simplify right side
    1,071x = 1,001,954.09
  5. Step 5: Solve for x
    x = 1,001,954.09/1,071
  6. Step 6: Final answer
    x = 935.53

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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.