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Finding the Fourth Proportional to 918.74, 1,259.75 and 891.41

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Solution

The fourth proportional to 918.74, 1,259.75 and 891.41 is: 1,222.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.74 : 1,259.75 = 891.41 : x
  2. Step 2: Convert to fraction form
    918.74/1,259.75 = 891.41/x
  3. Step 3: Cross multiply
    918.74x = 1,259.75 × 891.41
  4. Step 4: Simplify right side
    918.74x = 1,122,949.68
  5. Step 5: Solve for x
    x = 1,122,949.68/918.74
  6. Step 6: Final answer
    x = 1,222.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.