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Finding the Fourth Proportional to 1,390.78, 1,922.88 and 1,329.58

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Solution

The fourth proportional to 1,390.78, 1,922.88 and 1,329.58 is: 1,838.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.78 : 1,922.88 = 1,329.58 : x
  2. Step 2: Convert to fraction form
    1,390.78/1,922.88 = 1,329.58/x
  3. Step 3: Cross multiply
    1,390.78x = 1,922.88 × 1,329.58
  4. Step 4: Simplify right side
    1,390.78x = 2,556,622.79
  5. Step 5: Solve for x
    x = 2,556,622.79/1,390.78
  6. Step 6: Final answer
    x = 1,838.27

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1.5x scale

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.