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Finding the Fourth Proportional to 807.23, 1,208.66 and 421.67

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Solution

The fourth proportional to 807.23, 1,208.66 and 421.67 is: 631.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.23 : 1,208.66 = 421.67 : x
  2. Step 2: Convert to fraction form
    807.23/1,208.66 = 421.67/x
  3. Step 3: Cross multiply
    807.23x = 1,208.66 × 421.67
  4. Step 4: Simplify right side
    807.23x = 509,647.51
  5. Step 5: Solve for x
    x = 509,647.51/807.23
  6. Step 6: Final answer
    x = 631.36

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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.