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Finding the Fourth Proportional to 1,071.66, 1,478.88 and 679.01

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Solution

The fourth proportional to 1,071.66, 1,478.88 and 679.01 is: 937.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.66 : 1,478.88 = 679.01 : x
  2. Step 2: Convert to fraction form
    1,071.66/1,478.88 = 679.01/x
  3. Step 3: Cross multiply
    1,071.66x = 1,478.88 × 679.01
  4. Step 4: Simplify right side
    1,071.66x = 1,004,166.91
  5. Step 5: Solve for x
    x = 1,004,166.91/1,071.66
  6. Step 6: Final answer
    x = 937.02

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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.