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Finding the Fourth Proportional to 259.02, 387.55 and 172.56

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Solution

The fourth proportional to 259.02, 387.55 and 172.56 is: 258.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.02 : 387.55 = 172.56 : x
  2. Step 2: Convert to fraction form
    259.02/387.55 = 172.56/x
  3. Step 3: Cross multiply
    259.02x = 387.55 × 172.56
  4. Step 4: Simplify right side
    259.02x = 66,875.20
  5. Step 5: Solve for x
    x = 66,875.20/259.02
  6. Step 6: Final answer
    x = 258.19

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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.