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Finding the Fourth Proportional to 1,585.64, 2,188.20 and 887

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Solution

The fourth proportional to 1,585.64, 2,188.20 and 887 is: 1,224.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,585.64 : 2,188.20 = 887 : x
  2. Step 2: Convert to fraction form
    1,585.64/2,188.20 = 887/x
  3. Step 3: Cross multiply
    1,585.64x = 2,188.20 × 887
  4. Step 4: Simplify right side
    1,585.64x = 1,940,933.40
  5. Step 5: Solve for x
    x = 1,940,933.40/1,585.64
  6. Step 6: Final answer
    x = 1,224.07

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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.