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Finding the Fourth Proportional to 703.60, 1,055.40 and 692.80

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Solution

The fourth proportional to 703.60, 1,055.40 and 692.80 is: 1,039.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    703.60 : 1,055.40 = 692.80 : x
  2. Step 2: Convert to fraction form
    703.60/1,055.40 = 692.80/x
  3. Step 3: Cross multiply
    703.60x = 1,055.40 × 692.80
  4. Step 4: Simplify right side
    703.60x = 731,181.12
  5. Step 5: Solve for x
    x = 731,181.12/703.60
  6. Step 6: Final answer
    x = 1,039.20

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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.