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Finding the Fourth Proportional to 672.86, 1,009.61 and 307.62

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Solution

The fourth proportional to 672.86, 1,009.61 and 307.62 is: 461.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.86 : 1,009.61 = 307.62 : x
  2. Step 2: Convert to fraction form
    672.86/1,009.61 = 307.62/x
  3. Step 3: Cross multiply
    672.86x = 1,009.61 × 307.62
  4. Step 4: Simplify right side
    672.86x = 310,576.23
  5. Step 5: Solve for x
    x = 310,576.23/672.86
  6. Step 6: Final answer
    x = 461.58

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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.