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Finding the Fourth Proportional to 672.89, 1,009.15 and 210.58

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Solution

The fourth proportional to 672.89, 1,009.15 and 210.58 is: 315.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.89 : 1,009.15 = 210.58 : x
  2. Step 2: Convert to fraction form
    672.89/1,009.15 = 210.58/x
  3. Step 3: Cross multiply
    672.89x = 1,009.15 × 210.58
  4. Step 4: Simplify right side
    672.89x = 212,506.81
  5. Step 5: Solve for x
    x = 212,506.81/672.89
  6. Step 6: Final answer
    x = 315.81

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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.