Home / 2,987.65-4,120.86-2,428.12

Finding the Fourth Proportional to 2,987.65, 4,120.86 and 2,428.12

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Solution

The fourth proportional to 2,987.65, 4,120.86 and 2,428.12 is: 3,349.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,987.65 : 4,120.86 = 2,428.12 : x
  2. Step 2: Convert to fraction form
    2,987.65/4,120.86 = 2,428.12/x
  3. Step 3: Cross multiply
    2,987.65x = 4,120.86 × 2,428.12
  4. Step 4: Simplify right side
    2,987.65x = 10,005,942.58
  5. Step 5: Solve for x
    x = 10,005,942.58/2,987.65
  6. Step 6: Final answer
    x = 3,349.10

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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.