Home / 4,989.40-7,479.99-1,987.74

Finding the Fourth Proportional to 4,989.40, 7,479.99 and 1,987.74

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Solution

The fourth proportional to 4,989.40, 7,479.99 and 1,987.74 is: 2,979.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,989.40 : 7,479.99 = 1,987.74 : x
  2. Step 2: Convert to fraction form
    4,989.40/7,479.99 = 1,987.74/x
  3. Step 3: Cross multiply
    4,989.40x = 7,479.99 × 1,987.74
  4. Step 4: Simplify right side
    4,989.40x = 14,868,275.32
  5. Step 5: Solve for x
    x = 14,868,275.32/4,989.40
  6. Step 6: Final answer
    x = 2,979.97

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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.