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Finding the Fourth Proportional to 1,398.08, 1,928.63 and 838.28

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Solution

The fourth proportional to 1,398.08, 1,928.63 and 838.28 is: 1,156.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.08 : 1,928.63 = 838.28 : x
  2. Step 2: Convert to fraction form
    1,398.08/1,928.63 = 838.28/x
  3. Step 3: Cross multiply
    1,398.08x = 1,928.63 × 838.28
  4. Step 4: Simplify right side
    1,398.08x = 1,616,727.77
  5. Step 5: Solve for x
    x = 1,616,727.77/1,398.08
  6. Step 6: Final answer
    x = 1,156.39

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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.