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Finding the Fourth Proportional to 1,381.60, 1,906.32 and 857.32

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Solution

The fourth proportional to 1,381.60, 1,906.32 and 857.32 is: 1,182.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.60 : 1,906.32 = 857.32 : x
  2. Step 2: Convert to fraction form
    1,381.60/1,906.32 = 857.32/x
  3. Step 3: Cross multiply
    1,381.60x = 1,906.32 × 857.32
  4. Step 4: Simplify right side
    1,381.60x = 1,634,326.26
  5. Step 5: Solve for x
    x = 1,634,326.26/1,381.60
  6. Step 6: Final answer
    x = 1,182.92

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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.