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Finding the Fourth Proportional to 1,775.10, 2,449.60 and 989.10

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Solution

The fourth proportional to 1,775.10, 2,449.60 and 989.10 is: 1,364.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,775.10 : 2,449.60 = 989.10 : x
  2. Step 2: Convert to fraction form
    1,775.10/2,449.60 = 989.10/x
  3. Step 3: Cross multiply
    1,775.10x = 2,449.60 × 989.10
  4. Step 4: Simplify right side
    1,775.10x = 2,422,899.36
  5. Step 5: Solve for x
    x = 2,422,899.36/1,775.10
  6. Step 6: Final answer
    x = 1,364.94

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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.