Home / 7,121.61-9,827.51-3,977.55

Finding the Fourth Proportional to 7,121.61, 9,827.51 and 3,977.55

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Solution

The fourth proportional to 7,121.61, 9,827.51 and 3,977.55 is: 5,488.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,121.61 : 9,827.51 = 3,977.55 : x
  2. Step 2: Convert to fraction form
    7,121.61/9,827.51 = 3,977.55/x
  3. Step 3: Cross multiply
    7,121.61x = 9,827.51 × 3,977.55
  4. Step 4: Simplify right side
    7,121.61x = 39,089,392.51
  5. Step 5: Solve for x
    x = 39,089,392.51/7,121.61
  6. Step 6: Final answer
    x = 5,488.84

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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.