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Finding the Fourth Proportional to 1,130.94, 1,556.46 and 881.28

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Solution

The fourth proportional to 1,130.94, 1,556.46 and 881.28 is: 1,212.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,130.94 : 1,556.46 = 881.28 : x
  2. Step 2: Convert to fraction form
    1,130.94/1,556.46 = 881.28/x
  3. Step 3: Cross multiply
    1,130.94x = 1,556.46 × 881.28
  4. Step 4: Simplify right side
    1,130.94x = 1,371,677.07
  5. Step 5: Solve for x
    x = 1,371,677.07/1,130.94
  6. Step 6: Final answer
    x = 1,212.86

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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.