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Finding the Fourth Proportional to 672, 1,008.45 and 287.34

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Solution

The fourth proportional to 672, 1,008.45 and 287.34 is: 431.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    672 : 1,008.45 = 287.34 : x
  2. Step 2: Convert to fraction form
    672/1,008.45 = 287.34/x
  3. Step 3: Cross multiply
    672x = 1,008.45 × 287.34
  4. Step 4: Simplify right side
    672x = 289,768.02
  5. Step 5: Solve for x
    x = 289,768.02/672
  6. Step 6: Final answer
    x = 431.20

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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.