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Finding the Fourth Proportional to 1,708.30, 2,560.48 and 831.24

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Solution

The fourth proportional to 1,708.30, 2,560.48 and 831.24 is: 1,245.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,708.30 : 2,560.48 = 831.24 : x
  2. Step 2: Convert to fraction form
    1,708.30/2,560.48 = 831.24/x
  3. Step 3: Cross multiply
    1,708.30x = 2,560.48 × 831.24
  4. Step 4: Simplify right side
    1,708.30x = 2,128,373.40
  5. Step 5: Solve for x
    x = 2,128,373.40/1,708.30
  6. Step 6: Final answer
    x = 1,245.90

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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.