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Finding the Fourth Proportional to 541.55, 810.75 and 405.20

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Solution

The fourth proportional to 541.55, 810.75 and 405.20 is: 606.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    541.55 : 810.75 = 405.20 : x
  2. Step 2: Convert to fraction form
    541.55/810.75 = 405.20/x
  3. Step 3: Cross multiply
    541.55x = 810.75 × 405.20
  4. Step 4: Simplify right side
    541.55x = 328,515.90
  5. Step 5: Solve for x
    x = 328,515.90/541.55
  6. Step 6: Final answer
    x = 606.62

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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.