Home / 2,987.10-4,119.95-1,806.70

Finding the Fourth Proportional to 2,987.10, 4,119.95 and 1,806.70

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Solution

The fourth proportional to 2,987.10, 4,119.95 and 1,806.70 is: 2,491.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,987.10 : 4,119.95 = 1,806.70 : x
  2. Step 2: Convert to fraction form
    2,987.10/4,119.95 = 1,806.70/x
  3. Step 3: Cross multiply
    2,987.10x = 4,119.95 × 1,806.70
  4. Step 4: Simplify right side
    2,987.10x = 7,443,513.67
  5. Step 5: Solve for x
    x = 7,443,513.67/2,987.10
  6. Step 6: Final answer
    x = 2,491.89

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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.