Home / 1,392.76-1,921.08-1,299

Finding the Fourth Proportional to 1,392.76, 1,921.08 and 1,299

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Solution

The fourth proportional to 1,392.76, 1,921.08 and 1,299 is: 1,791.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.76 : 1,921.08 = 1,299 : x
  2. Step 2: Convert to fraction form
    1,392.76/1,921.08 = 1,299/x
  3. Step 3: Cross multiply
    1,392.76x = 1,921.08 × 1,299
  4. Step 4: Simplify right side
    1,392.76x = 2,495,482.92
  5. Step 5: Solve for x
    x = 2,495,482.92/1,392.76
  6. Step 6: Final answer
    x = 1,791.75

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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.