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Finding the Fourth Proportional to 760.20, 1,140.30 and 327.05

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Solution

The fourth proportional to 760.20, 1,140.30 and 327.05 is: 490.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.20 : 1,140.30 = 327.05 : x
  2. Step 2: Convert to fraction form
    760.20/1,140.30 = 327.05/x
  3. Step 3: Cross multiply
    760.20x = 1,140.30 × 327.05
  4. Step 4: Simplify right side
    760.20x = 372,937.97
  5. Step 5: Solve for x
    x = 372,937.97/760.20
  6. Step 6: Final answer
    x = 490.58

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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.