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Finding the Fourth Proportional to 1,203.23, 1,658.91 and 986.85

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Solution

The fourth proportional to 1,203.23, 1,658.91 and 986.85 is: 1,360.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,203.23 : 1,658.91 = 986.85 : x
  2. Step 2: Convert to fraction form
    1,203.23/1,658.91 = 986.85/x
  3. Step 3: Cross multiply
    1,203.23x = 1,658.91 × 986.85
  4. Step 4: Simplify right side
    1,203.23x = 1,637,089.51
  5. Step 5: Solve for x
    x = 1,637,089.51/1,203.23
  6. Step 6: Final answer
    x = 1,360.58

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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.