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Finding the Fourth Proportional to 1,310.14, 1,807.96 and 720.70

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Solution

The fourth proportional to 1,310.14, 1,807.96 and 720.70 is: 994.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,310.14 : 1,807.96 = 720.70 : x
  2. Step 2: Convert to fraction form
    1,310.14/1,807.96 = 720.70/x
  3. Step 3: Cross multiply
    1,310.14x = 1,807.96 × 720.70
  4. Step 4: Simplify right side
    1,310.14x = 1,302,996.77
  5. Step 5: Solve for x
    x = 1,302,996.77/1,310.14
  6. Step 6: Final answer
    x = 994.55

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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.