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Finding the Fourth Proportional to 769.63, 1,153.98 and 358.86

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Solution

The fourth proportional to 769.63, 1,153.98 and 358.86 is: 538.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.63 : 1,153.98 = 358.86 : x
  2. Step 2: Convert to fraction form
    769.63/1,153.98 = 358.86/x
  3. Step 3: Cross multiply
    769.63x = 1,153.98 × 358.86
  4. Step 4: Simplify right side
    769.63x = 414,118.16
  5. Step 5: Solve for x
    x = 414,118.16/769.63
  6. Step 6: Final answer
    x = 538.07

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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.