Home / 2,900.91-4,031.02-2,870.80

Finding the Fourth Proportional to 2,900.91, 4,031.02 and 2,870.80

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Solution

The fourth proportional to 2,900.91, 4,031.02 and 2,870.80 is: 3,989.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,900.91 : 4,031.02 = 2,870.80 : x
  2. Step 2: Convert to fraction form
    2,900.91/4,031.02 = 2,870.80/x
  3. Step 3: Cross multiply
    2,900.91x = 4,031.02 × 2,870.80
  4. Step 4: Simplify right side
    2,900.91x = 11,572,252.22
  5. Step 5: Solve for x
    x = 11,572,252.22/2,900.91
  6. Step 6: Final answer
    x = 3,989.18

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.