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Finding the Fourth Proportional to 1,398.01, 1,929 and 808.33

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Solution

The fourth proportional to 1,398.01, 1,929 and 808.33 is: 1,115.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.01 : 1,929 = 808.33 : x
  2. Step 2: Convert to fraction form
    1,398.01/1,929 = 808.33/x
  3. Step 3: Cross multiply
    1,398.01x = 1,929 × 808.33
  4. Step 4: Simplify right side
    1,398.01x = 1,559,268.57
  5. Step 5: Solve for x
    x = 1,559,268.57/1,398.01
  6. Step 6: Final answer
    x = 1,115.35

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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.