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Finding the Fourth Proportional to 760.52, 1,139.74 and 327.12

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Solution

The fourth proportional to 760.52, 1,139.74 and 327.12 is: 490.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.52 : 1,139.74 = 327.12 : x
  2. Step 2: Convert to fraction form
    760.52/1,139.74 = 327.12/x
  3. Step 3: Cross multiply
    760.52x = 1,139.74 × 327.12
  4. Step 4: Simplify right side
    760.52x = 372,831.75
  5. Step 5: Solve for x
    x = 372,831.75/760.52
  6. Step 6: Final answer
    x = 490.23

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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.