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Finding the Fourth Proportional to 1,222.77, 1,685.21 and 1,001.01

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Solution

The fourth proportional to 1,222.77, 1,685.21 and 1,001.01 is: 1,379.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.77 : 1,685.21 = 1,001.01 : x
  2. Step 2: Convert to fraction form
    1,222.77/1,685.21 = 1,001.01/x
  3. Step 3: Cross multiply
    1,222.77x = 1,685.21 × 1,001.01
  4. Step 4: Simplify right side
    1,222.77x = 1,686,907.06
  5. Step 5: Solve for x
    x = 1,686,907.06/1,222.77
  6. Step 6: Final answer
    x = 1,379.58

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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.