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Finding the Fourth Proportional to 1,327.12, 1,831.16 and 767.60

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Solution

The fourth proportional to 1,327.12, 1,831.16 and 767.60 is: 1,059.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,327.12 : 1,831.16 = 767.60 : x
  2. Step 2: Convert to fraction form
    1,327.12/1,831.16 = 767.60/x
  3. Step 3: Cross multiply
    1,327.12x = 1,831.16 × 767.60
  4. Step 4: Simplify right side
    1,327.12x = 1,405,598.42
  5. Step 5: Solve for x
    x = 1,405,598.42/1,327.12
  6. Step 6: Final answer
    x = 1,059.13

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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.