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Finding the Fourth Proportional to 5,390.95, 8,080.95 and 4,089.69

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Solution

The fourth proportional to 5,390.95, 8,080.95 and 4,089.69 is: 6,130.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,390.95 : 8,080.95 = 4,089.69 : x
  2. Step 2: Convert to fraction form
    5,390.95/8,080.95 = 4,089.69/x
  3. Step 3: Cross multiply
    5,390.95x = 8,080.95 × 4,089.69
  4. Step 4: Simplify right side
    5,390.95x = 33,048,580.41
  5. Step 5: Solve for x
    x = 33,048,580.41/5,390.95
  6. Step 6: Final answer
    x = 6,130.38

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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.