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Finding the Fourth Proportional to 769.79, 1,154.30 and 307.21

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Solution

The fourth proportional to 769.79, 1,154.30 and 307.21 is: 460.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.79 : 1,154.30 = 307.21 : x
  2. Step 2: Convert to fraction form
    769.79/1,154.30 = 307.21/x
  3. Step 3: Cross multiply
    769.79x = 1,154.30 × 307.21
  4. Step 4: Simplify right side
    769.79x = 354,612.50
  5. Step 5: Solve for x
    x = 354,612.50/769.79
  6. Step 6: Final answer
    x = 460.66

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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.