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Finding the Fourth Proportional to 2,362.40, 3,542.40 and 1,129.60

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Solution

The fourth proportional to 2,362.40, 3,542.40 and 1,129.60 is: 1,693.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,362.40 : 3,542.40 = 1,129.60 : x
  2. Step 2: Convert to fraction form
    2,362.40/3,542.40 = 1,129.60/x
  3. Step 3: Cross multiply
    2,362.40x = 3,542.40 × 1,129.60
  4. Step 4: Simplify right side
    2,362.40x = 4,001,495.04
  5. Step 5: Solve for x
    x = 4,001,495.04/2,362.40
  6. Step 6: Final answer
    x = 1,693.83

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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.