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Finding the Fourth Proportional to 5,780.74, 7,977.42 and 3,128.15

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Solution

The fourth proportional to 5,780.74, 7,977.42 and 3,128.15 is: 4,316.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,780.74 : 7,977.42 = 3,128.15 : x
  2. Step 2: Convert to fraction form
    5,780.74/7,977.42 = 3,128.15/x
  3. Step 3: Cross multiply
    5,780.74x = 7,977.42 × 3,128.15
  4. Step 4: Simplify right side
    5,780.74x = 24,954,582.69
  5. Step 5: Solve for x
    x = 24,954,582.69/5,780.74
  6. Step 6: Final answer
    x = 4,316.85

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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.