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Finding the Fourth Proportional to 1,398.03, 1,929.19 and 838.55

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Solution

The fourth proportional to 1,398.03, 1,929.19 and 838.55 is: 1,157.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.03 : 1,929.19 = 838.55 : x
  2. Step 2: Convert to fraction form
    1,398.03/1,929.19 = 838.55/x
  3. Step 3: Cross multiply
    1,398.03x = 1,929.19 × 838.55
  4. Step 4: Simplify right side
    1,398.03x = 1,617,722.27
  5. Step 5: Solve for x
    x = 1,617,722.27/1,398.03
  6. Step 6: Final answer
    x = 1,157.14

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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.