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Finding the Fourth Proportional to 1,551, 2,140.39 and 887.88

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Solution

The fourth proportional to 1,551, 2,140.39 and 887.88 is: 1,225.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,551 : 2,140.39 = 887.88 : x
  2. Step 2: Convert to fraction form
    1,551/2,140.39 = 887.88/x
  3. Step 3: Cross multiply
    1,551x = 2,140.39 × 887.88
  4. Step 4: Simplify right side
    1,551x = 1,900,409.47
  5. Step 5: Solve for x
    x = 1,900,409.47/1,551
  6. Step 6: Final answer
    x = 1,225.28

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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.