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Finding the Fourth Proportional to 760.20, 1,049.19 and 428.66

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Solution

The fourth proportional to 760.20, 1,049.19 and 428.66 is: 591.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.20 : 1,049.19 = 428.66 : x
  2. Step 2: Convert to fraction form
    760.20/1,049.19 = 428.66/x
  3. Step 3: Cross multiply
    760.20x = 1,049.19 × 428.66
  4. Step 4: Simplify right side
    760.20x = 449,740.54
  5. Step 5: Solve for x
    x = 449,740.54/760.20
  6. Step 6: Final answer
    x = 591.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.