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Finding the Fourth Proportional to 1,231.75, 1,698.93 and 918.10

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Solution

The fourth proportional to 1,231.75, 1,698.93 and 918.10 is: 1,266.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.75 : 1,698.93 = 918.10 : x
  2. Step 2: Convert to fraction form
    1,231.75/1,698.93 = 918.10/x
  3. Step 3: Cross multiply
    1,231.75x = 1,698.93 × 918.10
  4. Step 4: Simplify right side
    1,231.75x = 1,559,787.63
  5. Step 5: Solve for x
    x = 1,559,787.63/1,231.75
  6. Step 6: Final answer
    x = 1,266.32

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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.