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Finding the Fourth Proportional to 1,310.45, 1,808.43 and 721.00

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Solution

The fourth proportional to 1,310.45, 1,808.43 and 721.00 is: 994.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,310.45 : 1,808.43 = 721.00 : x
  2. Step 2: Convert to fraction form
    1,310.45/1,808.43 = 721.00/x
  3. Step 3: Cross multiply
    1,310.45x = 1,808.43 × 721.00
  4. Step 4: Simplify right side
    1,310.45x = 1,303,877.59
  5. Step 5: Solve for x
    x = 1,303,877.59/1,310.45
  6. Step 6: Final answer
    x = 994.99

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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.