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Finding the Fourth Proportional to 1,369.34, 2,053.65 and 776.80

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Solution

The fourth proportional to 1,369.34, 2,053.65 and 776.80 is: 1,164.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,369.34 : 2,053.65 = 776.80 : x
  2. Step 2: Convert to fraction form
    1,369.34/2,053.65 = 776.80/x
  3. Step 3: Cross multiply
    1,369.34x = 2,053.65 × 776.80
  4. Step 4: Simplify right side
    1,369.34x = 1,595,265.05
  5. Step 5: Solve for x
    x = 1,595,265.05/1,369.34
  6. Step 6: Final answer
    x = 1,164.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.