Home / 2,078.36-3,116.65-691.32

Finding the Fourth Proportional to 2,078.36, 3,116.65 and 691.32

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Solution

The fourth proportional to 2,078.36, 3,116.65 and 691.32 is: 1,036.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,078.36 : 3,116.65 = 691.32 : x
  2. Step 2: Convert to fraction form
    2,078.36/3,116.65 = 691.32/x
  3. Step 3: Cross multiply
    2,078.36x = 3,116.65 × 691.32
  4. Step 4: Simplify right side
    2,078.36x = 2,154,602.48
  5. Step 5: Solve for x
    x = 2,154,602.48/2,078.36
  6. Step 6: Final answer
    x = 1,036.68

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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.