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Finding the Fourth Proportional to 672.96, 933.60 and 655.20

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Solution

The fourth proportional to 672.96, 933.60 and 655.20 is: 908.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.96 : 933.60 = 655.20 : x
  2. Step 2: Convert to fraction form
    672.96/933.60 = 655.20/x
  3. Step 3: Cross multiply
    672.96x = 933.60 × 655.20
  4. Step 4: Simplify right side
    672.96x = 611,694.72
  5. Step 5: Solve for x
    x = 611,694.72/672.96
  6. Step 6: Final answer
    x = 908.96

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.