Home / 3,928.47-5,421.08-2,159.74

Finding the Fourth Proportional to 3,928.47, 5,421.08 and 2,159.74

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Solution

The fourth proportional to 3,928.47, 5,421.08 and 2,159.74 is: 2,980.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,928.47 : 5,421.08 = 2,159.74 : x
  2. Step 2: Convert to fraction form
    3,928.47/5,421.08 = 2,159.74/x
  3. Step 3: Cross multiply
    3,928.47x = 5,421.08 × 2,159.74
  4. Step 4: Simplify right side
    3,928.47x = 11,708,115.17
  5. Step 5: Solve for x
    x = 11,708,115.17/3,928.47
  6. Step 6: Final answer
    x = 2,980.32

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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.