Home / 2,159.48-2,979.87-1,215.12

Finding the Fourth Proportional to 2,159.48, 2,979.87 and 1,215.12

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Solution

The fourth proportional to 2,159.48, 2,979.87 and 1,215.12 is: 1,676.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,159.48 : 2,979.87 = 1,215.12 : x
  2. Step 2: Convert to fraction form
    2,159.48/2,979.87 = 1,215.12/x
  3. Step 3: Cross multiply
    2,159.48x = 2,979.87 × 1,215.12
  4. Step 4: Simplify right side
    2,159.48x = 3,620,899.63
  5. Step 5: Solve for x
    x = 3,620,899.63/2,159.48
  6. Step 6: Final answer
    x = 1,676.75

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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.