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Finding the Fourth Proportional to 2,719.72, 4,080.12 and 988.30

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Solution

The fourth proportional to 2,719.72, 4,080.12 and 988.30 is: 1,482.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,719.72 : 4,080.12 = 988.30 : x
  2. Step 2: Convert to fraction form
    2,719.72/4,080.12 = 988.30/x
  3. Step 3: Cross multiply
    2,719.72x = 4,080.12 × 988.30
  4. Step 4: Simplify right side
    2,719.72x = 4,032,382.60
  5. Step 5: Solve for x
    x = 4,032,382.60/2,719.72
  6. Step 6: Final answer
    x = 1,482.65

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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.