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Finding the Fourth Proportional to 287.32, 431.10 and 172.00

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Solution

The fourth proportional to 287.32, 431.10 and 172.00 is: 258.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.32 : 431.10 = 172.00 : x
  2. Step 2: Convert to fraction form
    287.32/431.10 = 172.00/x
  3. Step 3: Cross multiply
    287.32x = 431.10 × 172.00
  4. Step 4: Simplify right side
    287.32x = 74,147.04
  5. Step 5: Solve for x
    x = 74,147.04/287.32
  6. Step 6: Final answer
    x = 258.07

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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.