Home / 3,931.40-5,420.58-2,881.64

Finding the Fourth Proportional to 3,931.40, 5,420.58 and 2,881.64

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Solution

The fourth proportional to 3,931.40, 5,420.58 and 2,881.64 is: 3,973.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,931.40 : 5,420.58 = 2,881.64 : x
  2. Step 2: Convert to fraction form
    3,931.40/5,420.58 = 2,881.64/x
  3. Step 3: Cross multiply
    3,931.40x = 5,420.58 × 2,881.64
  4. Step 4: Simplify right side
    3,931.40x = 15,620,160.15
  5. Step 5: Solve for x
    x = 15,620,160.15/3,931.40
  6. Step 6: Final answer
    x = 3,973.18

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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.