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Finding the Fourth Proportional to 1,605.81, 2,215.19 and 1,047.21

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Solution

The fourth proportional to 1,605.81, 2,215.19 and 1,047.21 is: 1,444.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,605.81 : 2,215.19 = 1,047.21 : x
  2. Step 2: Convert to fraction form
    1,605.81/2,215.19 = 1,047.21/x
  3. Step 3: Cross multiply
    1,605.81x = 2,215.19 × 1,047.21
  4. Step 4: Simplify right side
    1,605.81x = 2,319,763.88
  5. Step 5: Solve for x
    x = 2,319,763.88/1,605.81
  6. Step 6: Final answer
    x = 1,444.61

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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.