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Finding the Fourth Proportional to 1,245.67, 1,718.98 and 686.12

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Solution

The fourth proportional to 1,245.67, 1,718.98 and 686.12 is: 946.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.67 : 1,718.98 = 686.12 : x
  2. Step 2: Convert to fraction form
    1,245.67/1,718.98 = 686.12/x
  3. Step 3: Cross multiply
    1,245.67x = 1,718.98 × 686.12
  4. Step 4: Simplify right side
    1,245.67x = 1,179,416.25
  5. Step 5: Solve for x
    x = 1,179,416.25/1,245.67
  6. Step 6: Final answer
    x = 946.81

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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.