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Finding the Fourth Proportional to 538.21, 807.40 and 172.92

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Solution

The fourth proportional to 538.21, 807.40 and 172.92 is: 259.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.21 : 807.40 = 172.92 : x
  2. Step 2: Convert to fraction form
    538.21/807.40 = 172.92/x
  3. Step 3: Cross multiply
    538.21x = 807.40 × 172.92
  4. Step 4: Simplify right side
    538.21x = 139,614.31
  5. Step 5: Solve for x
    x = 139,614.31/538.21
  6. Step 6: Final answer
    x = 259.40

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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.