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Finding the Fourth Proportional to 5,780.79, 7,977.45 and 3,128.16

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Solution

The fourth proportional to 5,780.79, 7,977.45 and 3,128.16 is: 4,316.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,780.79 : 7,977.45 = 3,128.16 : x
  2. Step 2: Convert to fraction form
    5,780.79/7,977.45 = 3,128.16/x
  3. Step 3: Cross multiply
    5,780.79x = 7,977.45 × 3,128.16
  4. Step 4: Simplify right side
    5,780.79x = 24,954,739.99
  5. Step 5: Solve for x
    x = 24,954,739.99/5,780.79
  6. Step 6: Final answer
    x = 4,316.84

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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.