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Finding the Fourth Proportional to 5,140.60, 7,710.86 and 1,245

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Solution

The fourth proportional to 5,140.60, 7,710.86 and 1,245 is: 1,867.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,140.60 : 7,710.86 = 1,245 : x
  2. Step 2: Convert to fraction form
    5,140.60/7,710.86 = 1,245/x
  3. Step 3: Cross multiply
    5,140.60x = 7,710.86 × 1,245
  4. Step 4: Simplify right side
    5,140.60x = 9,600,020.70
  5. Step 5: Solve for x
    x = 9,600,020.70/5,140.60
  6. Step 6: Final answer
    x = 1,867.49

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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.