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Finding the Fourth Proportional to 207.21, 310.95 and 172.59

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Solution

The fourth proportional to 207.21, 310.95 and 172.59 is: 259.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.21 : 310.95 = 172.59 : x
  2. Step 2: Convert to fraction form
    207.21/310.95 = 172.59/x
  3. Step 3: Cross multiply
    207.21x = 310.95 × 172.59
  4. Step 4: Simplify right side
    207.21x = 53,666.86
  5. Step 5: Solve for x
    x = 53,666.86/207.21
  6. Step 6: Final answer
    x = 259.00

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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.