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Finding the Fourth Proportional to 1,071.76, 1,479.21 and 694.11

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Solution

The fourth proportional to 1,071.76, 1,479.21 and 694.11 is: 957.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.76 : 1,479.21 = 694.11 : x
  2. Step 2: Convert to fraction form
    1,071.76/1,479.21 = 694.11/x
  3. Step 3: Cross multiply
    1,071.76x = 1,479.21 × 694.11
  4. Step 4: Simplify right side
    1,071.76x = 1,026,734.45
  5. Step 5: Solve for x
    x = 1,026,734.45/1,071.76
  6. Step 6: Final answer
    x = 957.99

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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.