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Finding the Fourth Proportional to 763.10, 1,143.88 and 300.58

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Solution

The fourth proportional to 763.10, 1,143.88 and 300.58 is: 450.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.10 : 1,143.88 = 300.58 : x
  2. Step 2: Convert to fraction form
    763.10/1,143.88 = 300.58/x
  3. Step 3: Cross multiply
    763.10x = 1,143.88 × 300.58
  4. Step 4: Simplify right side
    763.10x = 343,827.45
  5. Step 5: Solve for x
    x = 343,827.45/763.10
  6. Step 6: Final answer
    x = 450.57

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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.