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Finding the Fourth Proportional to 3,907.86, 5,392.80 and 2,139.48

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Solution

The fourth proportional to 3,907.86, 5,392.80 and 2,139.48 is: 2,952.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,907.86 : 5,392.80 = 2,139.48 : x
  2. Step 2: Convert to fraction form
    3,907.86/5,392.80 = 2,139.48/x
  3. Step 3: Cross multiply
    3,907.86x = 5,392.80 × 2,139.48
  4. Step 4: Simplify right side
    3,907.86x = 11,537,787.74
  5. Step 5: Solve for x
    x = 11,537,787.74/3,907.86
  6. Step 6: Final answer
    x = 2,952.46

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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.