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Finding the Fourth Proportional to 679.21, 1,013.94 and 631.04

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Solution

The fourth proportional to 679.21, 1,013.94 and 631.04 is: 942.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.21 : 1,013.94 = 631.04 : x
  2. Step 2: Convert to fraction form
    679.21/1,013.94 = 631.04/x
  3. Step 3: Cross multiply
    679.21x = 1,013.94 × 631.04
  4. Step 4: Simplify right side
    679.21x = 639,831.63
  5. Step 5: Solve for x
    x = 639,831.63/679.21
  6. Step 6: Final answer
    x = 942.03

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.