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Finding the Fourth Proportional to 1,129.60, 1,693.60 and 513.60

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Solution

The fourth proportional to 1,129.60, 1,693.60 and 513.60 is: 770.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.60 : 1,693.60 = 513.60 : x
  2. Step 2: Convert to fraction form
    1,129.60/1,693.60 = 513.60/x
  3. Step 3: Cross multiply
    1,129.60x = 1,693.60 × 513.60
  4. Step 4: Simplify right side
    1,129.60x = 869,832.96
  5. Step 5: Solve for x
    x = 869,832.96/1,129.60
  6. Step 6: Final answer
    x = 770.04

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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.