Home / 5,128.95-7,077.88-2,890.84

Finding the Fourth Proportional to 5,128.95, 7,077.88 and 2,890.84

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Solution

The fourth proportional to 5,128.95, 7,077.88 and 2,890.84 is: 3,989.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,128.95 : 7,077.88 = 2,890.84 : x
  2. Step 2: Convert to fraction form
    5,128.95/7,077.88 = 2,890.84/x
  3. Step 3: Cross multiply
    5,128.95x = 7,077.88 × 2,890.84
  4. Step 4: Simplify right side
    5,128.95x = 20,461,017.81
  5. Step 5: Solve for x
    x = 20,461,017.81/5,128.95
  6. Step 6: Final answer
    x = 3,989.32

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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.