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Finding the Fourth Proportional to 673.38, 1,009.16 and 653.68

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Solution

The fourth proportional to 673.38, 1,009.16 and 653.68 is: 979.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    673.38 : 1,009.16 = 653.68 : x
  2. Step 2: Convert to fraction form
    673.38/1,009.16 = 653.68/x
  3. Step 3: Cross multiply
    673.38x = 1,009.16 × 653.68
  4. Step 4: Simplify right side
    673.38x = 659,667.71
  5. Step 5: Solve for x
    x = 659,667.71/673.38
  6. Step 6: Final answer
    x = 979.64

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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.