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Finding the Fourth Proportional to 674.76, 1,011.16 and 309.40

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Solution

The fourth proportional to 674.76, 1,011.16 and 309.40 is: 463.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.76 : 1,011.16 = 309.40 : x
  2. Step 2: Convert to fraction form
    674.76/1,011.16 = 309.40/x
  3. Step 3: Cross multiply
    674.76x = 1,011.16 × 309.40
  4. Step 4: Simplify right side
    674.76x = 312,852.90
  5. Step 5: Solve for x
    x = 312,852.90/674.76
  6. Step 6: Final answer
    x = 463.65

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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.