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Finding the Fourth Proportional to 1,321.40, 1,985.73 and 705.56

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Solution

The fourth proportional to 1,321.40, 1,985.73 and 705.56 is: 1,060.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.40 : 1,985.73 = 705.56 : x
  2. Step 2: Convert to fraction form
    1,321.40/1,985.73 = 705.56/x
  3. Step 3: Cross multiply
    1,321.40x = 1,985.73 × 705.56
  4. Step 4: Simplify right side
    1,321.40x = 1,401,051.66
  5. Step 5: Solve for x
    x = 1,401,051.66/1,321.40
  6. Step 6: Final answer
    x = 1,060.28

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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.