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Finding the Fourth Proportional to 714.46, 1,071.93 and 389.65

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Solution

The fourth proportional to 714.46, 1,071.93 and 389.65 is: 584.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.46 : 1,071.93 = 389.65 : x
  2. Step 2: Convert to fraction form
    714.46/1,071.93 = 389.65/x
  3. Step 3: Cross multiply
    714.46x = 1,071.93 × 389.65
  4. Step 4: Simplify right side
    714.46x = 417,677.52
  5. Step 5: Solve for x
    x = 417,677.52/714.46
  6. Step 6: Final answer
    x = 584.61

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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.