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Finding the Fourth Proportional to 3,642.72, 5,030.12 and 2,855.40

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Solution

The fourth proportional to 3,642.72, 5,030.12 and 2,855.40 is: 3,942.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,642.72 : 5,030.12 = 2,855.40 : x
  2. Step 2: Convert to fraction form
    3,642.72/5,030.12 = 2,855.40/x
  3. Step 3: Cross multiply
    3,642.72x = 5,030.12 × 2,855.40
  4. Step 4: Simplify right side
    3,642.72x = 14,363,004.65
  5. Step 5: Solve for x
    x = 14,363,004.65/3,642.72
  6. Step 6: Final answer
    x = 3,942.93

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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.