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Finding the Fourth Proportional to 1,370.88, 1,891.36 and 811.53

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Solution

The fourth proportional to 1,370.88, 1,891.36 and 811.53 is: 1,119.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,370.88 : 1,891.36 = 811.53 : x
  2. Step 2: Convert to fraction form
    1,370.88/1,891.36 = 811.53/x
  3. Step 3: Cross multiply
    1,370.88x = 1,891.36 × 811.53
  4. Step 4: Simplify right side
    1,370.88x = 1,534,891.32
  5. Step 5: Solve for x
    x = 1,534,891.32/1,370.88
  6. Step 6: Final answer
    x = 1,119.64

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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.