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Finding the Fourth Proportional to 674.15, 1,011.65 and 289.40

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Solution

The fourth proportional to 674.15, 1,011.65 and 289.40 is: 434.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.15 : 1,011.65 = 289.40 : x
  2. Step 2: Convert to fraction form
    674.15/1,011.65 = 289.40/x
  3. Step 3: Cross multiply
    674.15x = 1,011.65 × 289.40
  4. Step 4: Simplify right side
    674.15x = 292,765.00
  5. Step 5: Solve for x
    x = 292,765.00/674.15
  6. Step 6: Final answer
    x = 434.28

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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.