Home / 2,990.40-4,125.78-1,870.80

Finding the Fourth Proportional to 2,990.40, 4,125.78 and 1,870.80

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Solution

The fourth proportional to 2,990.40, 4,125.78 and 1,870.80 is: 2,581.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990.40 : 4,125.78 = 1,870.80 : x
  2. Step 2: Convert to fraction form
    2,990.40/4,125.78 = 1,870.80/x
  3. Step 3: Cross multiply
    2,990.40x = 4,125.78 × 1,870.80
  4. Step 4: Simplify right side
    2,990.40x = 7,718,509.22
  5. Step 5: Solve for x
    x = 7,718,509.22/2,990.40
  6. Step 6: Final answer
    x = 2,581.10

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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.