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Finding the Fourth Proportional to 714.54, 1,071.44 and 389.82

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Solution

The fourth proportional to 714.54, 1,071.44 and 389.82 is: 584.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.54 : 1,071.44 = 389.82 : x
  2. Step 2: Convert to fraction form
    714.54/1,071.44 = 389.82/x
  3. Step 3: Cross multiply
    714.54x = 1,071.44 × 389.82
  4. Step 4: Simplify right side
    714.54x = 417,668.74
  5. Step 5: Solve for x
    x = 417,668.74/714.54
  6. Step 6: Final answer
    x = 584.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.