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Finding the Fourth Proportional to 944.94, 1,409.72 and 920.79

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Solution

The fourth proportional to 944.94, 1,409.72 and 920.79 is: 1,373.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    944.94 : 1,409.72 = 920.79 : x
  2. Step 2: Convert to fraction form
    944.94/1,409.72 = 920.79/x
  3. Step 3: Cross multiply
    944.94x = 1,409.72 × 920.79
  4. Step 4: Simplify right side
    944.94x = 1,298,051.47
  5. Step 5: Solve for x
    x = 1,298,051.47/944.94
  6. Step 6: Final answer
    x = 1,373.69

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.