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Finding the Fourth Proportional to 631.90, 870.89 and 484.89

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Solution

The fourth proportional to 631.90, 870.89 and 484.89 is: 668.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.90 : 870.89 = 484.89 : x
  2. Step 2: Convert to fraction form
    631.90/870.89 = 484.89/x
  3. Step 3: Cross multiply
    631.90x = 870.89 × 484.89
  4. Step 4: Simplify right side
    631.90x = 422,279.07
  5. Step 5: Solve for x
    x = 422,279.07/631.90
  6. Step 6: Final answer
    x = 668.27

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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.