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Finding the Fourth Proportional to 1,245.55, 1,717.72 and 996.88

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Solution

The fourth proportional to 1,245.55, 1,717.72 and 996.88 is: 1,374.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.55 : 1,717.72 = 996.88 : x
  2. Step 2: Convert to fraction form
    1,245.55/1,717.72 = 996.88/x
  3. Step 3: Cross multiply
    1,245.55x = 1,717.72 × 996.88
  4. Step 4: Simplify right side
    1,245.55x = 1,712,360.71
  5. Step 5: Solve for x
    x = 1,712,360.71/1,245.55
  6. Step 6: Final answer
    x = 1,374.78

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1.5x scale

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.