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Finding the Fourth Proportional to 1,071.06, 1,605.69 and 421.44

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Solution

The fourth proportional to 1,071.06, 1,605.69 and 421.44 is: 631.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.06 : 1,605.69 = 421.44 : x
  2. Step 2: Convert to fraction form
    1,071.06/1,605.69 = 421.44/x
  3. Step 3: Cross multiply
    1,071.06x = 1,605.69 × 421.44
  4. Step 4: Simplify right side
    1,071.06x = 676,701.99
  5. Step 5: Solve for x
    x = 676,701.99/1,071.06
  6. Step 6: Final answer
    x = 631.81

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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.