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Finding the Fourth Proportional to 1,831.79, 2,748.28 and 661.79

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Solution

The fourth proportional to 1,831.79, 2,748.28 and 661.79 is: 992.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,831.79 : 2,748.28 = 661.79 : x
  2. Step 2: Convert to fraction form
    1,831.79/2,748.28 = 661.79/x
  3. Step 3: Cross multiply
    1,831.79x = 2,748.28 × 661.79
  4. Step 4: Simplify right side
    1,831.79x = 1,818,789.44
  5. Step 5: Solve for x
    x = 1,818,789.44/1,831.79
  6. Step 6: Final answer
    x = 992.90

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1.5x scale

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.