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Finding the Fourth Proportional to 714.77, 1,072.09 and 485.14

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Solution

The fourth proportional to 714.77, 1,072.09 and 485.14 is: 727.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.77 : 1,072.09 = 485.14 : x
  2. Step 2: Convert to fraction form
    714.77/1,072.09 = 485.14/x
  3. Step 3: Cross multiply
    714.77x = 1,072.09 × 485.14
  4. Step 4: Simplify right side
    714.77x = 520,113.74
  5. Step 5: Solve for x
    x = 520,113.74/714.77
  6. Step 6: Final answer
    x = 727.67

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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.