Home / 1,642.47-2,267.21-979.99

Finding the Fourth Proportional to 1,642.47, 2,267.21 and 979.99

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Solution

The fourth proportional to 1,642.47, 2,267.21 and 979.99 is: 1,352.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,642.47 : 2,267.21 = 979.99 : x
  2. Step 2: Convert to fraction form
    1,642.47/2,267.21 = 979.99/x
  3. Step 3: Cross multiply
    1,642.47x = 2,267.21 × 979.99
  4. Step 4: Simplify right side
    1,642.47x = 2,221,826.89
  5. Step 5: Solve for x
    x = 2,221,826.89/1,642.47
  6. Step 6: Final answer
    x = 1,352.74

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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.