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Finding the Fourth Proportional to 1,371.58, 1,891.96 and 840.55

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Solution

The fourth proportional to 1,371.58, 1,891.96 and 840.55 is: 1,159.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,371.58 : 1,891.96 = 840.55 : x
  2. Step 2: Convert to fraction form
    1,371.58/1,891.96 = 840.55/x
  3. Step 3: Cross multiply
    1,371.58x = 1,891.96 × 840.55
  4. Step 4: Simplify right side
    1,371.58x = 1,590,289.02
  5. Step 5: Solve for x
    x = 1,590,289.02/1,371.58
  6. Step 6: Final answer
    x = 1,159.46

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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.