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Finding the Fourth Proportional to 3,386.16, 5,079.21 and 920.95

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Solution

The fourth proportional to 3,386.16, 5,079.21 and 920.95 is: 1,381.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,386.16 : 5,079.21 = 920.95 : x
  2. Step 2: Convert to fraction form
    3,386.16/5,079.21 = 920.95/x
  3. Step 3: Cross multiply
    3,386.16x = 5,079.21 × 920.95
  4. Step 4: Simplify right side
    3,386.16x = 4,677,698.45
  5. Step 5: Solve for x
    x = 4,677,698.45/3,386.16
  6. Step 6: Final answer
    x = 1,381.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.