Home / 1,689.21-2,533.93-811.90

Finding the Fourth Proportional to 1,689.21, 2,533.93 and 811.90

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Solution

The fourth proportional to 1,689.21, 2,533.93 and 811.90 is: 1,217.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,689.21 : 2,533.93 = 811.90 : x
  2. Step 2: Convert to fraction form
    1,689.21/2,533.93 = 811.90/x
  3. Step 3: Cross multiply
    1,689.21x = 2,533.93 × 811.90
  4. Step 4: Simplify right side
    1,689.21x = 2,057,289.40
  5. Step 5: Solve for x
    x = 2,057,289.40/1,689.21
  6. Step 6: Final answer
    x = 1,217.90

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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.