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Finding the Fourth Proportional to 542.28, 813.55 and 172.07

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Solution

The fourth proportional to 542.28, 813.55 and 172.07 is: 258.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.28 : 813.55 = 172.07 : x
  2. Step 2: Convert to fraction form
    542.28/813.55 = 172.07/x
  3. Step 3: Cross multiply
    542.28x = 813.55 × 172.07
  4. Step 4: Simplify right side
    542.28x = 139,987.55
  5. Step 5: Solve for x
    x = 139,987.55/542.28
  6. Step 6: Final answer
    x = 258.15

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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.