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Finding the Fourth Proportional to 1,349.61, 1,858.19 and 1,220.01

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Solution

The fourth proportional to 1,349.61, 1,858.19 and 1,220.01 is: 1,679.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,349.61 : 1,858.19 = 1,220.01 : x
  2. Step 2: Convert to fraction form
    1,349.61/1,858.19 = 1,220.01/x
  3. Step 3: Cross multiply
    1,349.61x = 1,858.19 × 1,220.01
  4. Step 4: Simplify right side
    1,349.61x = 2,267,004.28
  5. Step 5: Solve for x
    x = 2,267,004.28/1,349.61
  6. Step 6: Final answer
    x = 1,679.75

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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.