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Finding the Fourth Proportional to 288.51, 398.15 and 172.07

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Solution

The fourth proportional to 288.51, 398.15 and 172.07 is: 237.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.51 : 398.15 = 172.07 : x
  2. Step 2: Convert to fraction form
    288.51/398.15 = 172.07/x
  3. Step 3: Cross multiply
    288.51x = 398.15 × 172.07
  4. Step 4: Simplify right side
    288.51x = 68,506.82
  5. Step 5: Solve for x
    x = 68,506.82/288.51
  6. Step 6: Final answer
    x = 237.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.