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Finding the Fourth Proportional to 1,130.81, 1,698.59 and 692.26

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Solution

The fourth proportional to 1,130.81, 1,698.59 and 692.26 is: 1,039.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,130.81 : 1,698.59 = 692.26 : x
  2. Step 2: Convert to fraction form
    1,130.81/1,698.59 = 692.26/x
  3. Step 3: Cross multiply
    1,130.81x = 1,698.59 × 692.26
  4. Step 4: Simplify right side
    1,130.81x = 1,175,858.21
  5. Step 5: Solve for x
    x = 1,175,858.21/1,130.81
  6. Step 6: Final answer
    x = 1,039.84

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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.