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Finding the Fourth Proportional to 672.20, 1,005.60 and 607.40

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Solution

The fourth proportional to 672.20, 1,005.60 and 607.40 is: 908.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.20 : 1,005.60 = 607.40 : x
  2. Step 2: Convert to fraction form
    672.20/1,005.60 = 607.40/x
  3. Step 3: Cross multiply
    672.20x = 1,005.60 × 607.40
  4. Step 4: Simplify right side
    672.20x = 610,801.44
  5. Step 5: Solve for x
    x = 610,801.44/672.20
  6. Step 6: Final answer
    x = 908.66

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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.