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Finding the Fourth Proportional to 1,215.66, 1,675.44 and 841.98

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Solution

The fourth proportional to 1,215.66, 1,675.44 and 841.98 is: 1,160.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.66 : 1,675.44 = 841.98 : x
  2. Step 2: Convert to fraction form
    1,215.66/1,675.44 = 841.98/x
  3. Step 3: Cross multiply
    1,215.66x = 1,675.44 × 841.98
  4. Step 4: Simplify right side
    1,215.66x = 1,410,686.97
  5. Step 5: Solve for x
    x = 1,410,686.97/1,215.66
  6. Step 6: Final answer
    x = 1,160.43

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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.