Home / 1,358.08-2,039.84-811.32

Finding the Fourth Proportional to 1,358.08, 2,039.84 and 811.32

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Solution

The fourth proportional to 1,358.08, 2,039.84 and 811.32 is: 1,218.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,358.08 : 2,039.84 = 811.32 : x
  2. Step 2: Convert to fraction form
    1,358.08/2,039.84 = 811.32/x
  3. Step 3: Cross multiply
    1,358.08x = 2,039.84 × 811.32
  4. Step 4: Simplify right side
    1,358.08x = 1,654,962.99
  5. Step 5: Solve for x
    x = 1,654,962.99/1,358.08
  6. Step 6: Final answer
    x = 1,218.60

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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.