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Finding the Fourth Proportional to 1,127.44, 1,686.72 and 854.32

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Solution

The fourth proportional to 1,127.44, 1,686.72 and 854.32 is: 1,278.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.44 : 1,686.72 = 854.32 : x
  2. Step 2: Convert to fraction form
    1,127.44/1,686.72 = 854.32/x
  3. Step 3: Cross multiply
    1,127.44x = 1,686.72 × 854.32
  4. Step 4: Simplify right side
    1,127.44x = 1,440,998.63
  5. Step 5: Solve for x
    x = 1,440,998.63/1,127.44
  6. Step 6: Final answer
    x = 1,278.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.