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Finding the Fourth Proportional to 2,658.90, 3,988.53 and 810.18

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Solution

The fourth proportional to 2,658.90, 3,988.53 and 810.18 is: 1,215.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,658.90 : 3,988.53 = 810.18 : x
  2. Step 2: Convert to fraction form
    2,658.90/3,988.53 = 810.18/x
  3. Step 3: Cross multiply
    2,658.90x = 3,988.53 × 810.18
  4. Step 4: Simplify right side
    2,658.90x = 3,231,427.24
  5. Step 5: Solve for x
    x = 3,231,427.24/2,658.90
  6. Step 6: Final answer
    x = 1,215.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.