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Finding the Fourth Proportional to 1,322.91, 1,827.41 and 987.57

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Solution

The fourth proportional to 1,322.91, 1,827.41 and 987.57 is: 1,364.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,322.91 : 1,827.41 = 987.57 : x
  2. Step 2: Convert to fraction form
    1,322.91/1,827.41 = 987.57/x
  3. Step 3: Cross multiply
    1,322.91x = 1,827.41 × 987.57
  4. Step 4: Simplify right side
    1,322.91x = 1,804,690.36
  5. Step 5: Solve for x
    x = 1,804,690.36/1,322.91
  6. Step 6: Final answer
    x = 1,364.18

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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.