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Finding the Fourth Proportional to 1,371.88, 1,894.80 and 929

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Solution

The fourth proportional to 1,371.88, 1,894.80 and 929 is: 1,283.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,371.88 : 1,894.80 = 929 : x
  2. Step 2: Convert to fraction form
    1,371.88/1,894.80 = 929/x
  3. Step 3: Cross multiply
    1,371.88x = 1,894.80 × 929
  4. Step 4: Simplify right side
    1,371.88x = 1,760,269.20
  5. Step 5: Solve for x
    x = 1,760,269.20/1,371.88
  6. Step 6: Final answer
    x = 1,283.11

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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.