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Finding the Fourth Proportional to 631.00, 870.33 and 421.11

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Solution

The fourth proportional to 631.00, 870.33 and 421.11 is: 580.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.00 : 870.33 = 421.11 : x
  2. Step 2: Convert to fraction form
    631.00/870.33 = 421.11/x
  3. Step 3: Cross multiply
    631.00x = 870.33 × 421.11
  4. Step 4: Simplify right side
    631.00x = 366,504.67
  5. Step 5: Solve for x
    x = 366,504.67/631.00
  6. Step 6: Final answer
    x = 580.83

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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.