Home / 1,785.18-2,678.68-811.16

Finding the Fourth Proportional to 1,785.18, 2,678.68 and 811.16

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Solution

The fourth proportional to 1,785.18, 2,678.68 and 811.16 is: 1,217.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,785.18 : 2,678.68 = 811.16 : x
  2. Step 2: Convert to fraction form
    1,785.18/2,678.68 = 811.16/x
  3. Step 3: Cross multiply
    1,785.18x = 2,678.68 × 811.16
  4. Step 4: Simplify right side
    1,785.18x = 2,172,838.07
  5. Step 5: Solve for x
    x = 2,172,838.07/1,785.18
  6. Step 6: Final answer
    x = 1,217.15

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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.