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Finding the Fourth Proportional to 13,670.76, 18,865.64 and 7,702.42

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Solution

The fourth proportional to 13,670.76, 18,865.64 and 7,702.42 is: 10,629.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,670.76 : 18,865.64 = 7,702.42 : x
  2. Step 2: Convert to fraction form
    13,670.76/18,865.64 = 7,702.42/x
  3. Step 3: Cross multiply
    13,670.76x = 18,865.64 × 7,702.42
  4. Step 4: Simplify right side
    13,670.76x = 145,311,082.85
  5. Step 5: Solve for x
    x = 145,311,082.85/13,670.76
  6. Step 6: Final answer
    x = 10,629.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.