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Finding the Fourth Proportional to 673.07, 1,007.78 and 456.21

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Solution

The fourth proportional to 673.07, 1,007.78 and 456.21 is: 683.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    673.07 : 1,007.78 = 456.21 : x
  2. Step 2: Convert to fraction form
    673.07/1,007.78 = 456.21/x
  3. Step 3: Cross multiply
    673.07x = 1,007.78 × 456.21
  4. Step 4: Simplify right side
    673.07x = 459,757.03
  5. Step 5: Solve for x
    x = 459,757.03/673.07
  6. Step 6: Final answer
    x = 683.08

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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.