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Finding the Fourth Proportional to 1,235.90, 1,705.70 and 704.98

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Solution

The fourth proportional to 1,235.90, 1,705.70 and 704.98 is: 972.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,235.90 : 1,705.70 = 704.98 : x
  2. Step 2: Convert to fraction form
    1,235.90/1,705.70 = 704.98/x
  3. Step 3: Cross multiply
    1,235.90x = 1,705.70 × 704.98
  4. Step 4: Simplify right side
    1,235.90x = 1,202,484.39
  5. Step 5: Solve for x
    x = 1,202,484.39/1,235.90
  6. Step 6: Final answer
    x = 972.96

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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.