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Finding the Fourth Proportional to 1,245.48, 1,718.81 and 686.00

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Solution

The fourth proportional to 1,245.48, 1,718.81 and 686.00 is: 946.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.48 : 1,718.81 = 686.00 : x
  2. Step 2: Convert to fraction form
    1,245.48/1,718.81 = 686.00/x
  3. Step 3: Cross multiply
    1,245.48x = 1,718.81 × 686.00
  4. Step 4: Simplify right side
    1,245.48x = 1,179,091.64
  5. Step 5: Solve for x
    x = 1,179,091.64/1,245.48
  6. Step 6: Final answer
    x = 946.70

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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.