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Finding the Fourth Proportional to 13,707.48, 18,915.48 and 7,739.40

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Solution

The fourth proportional to 13,707.48, 18,915.48 and 7,739.40 is: 10,679.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,707.48 : 18,915.48 = 7,739.40 : x
  2. Step 2: Convert to fraction form
    13,707.48/18,915.48 = 7,739.40/x
  3. Step 3: Cross multiply
    13,707.48x = 18,915.48 × 7,739.40
  4. Step 4: Simplify right side
    13,707.48x = 146,394,465.91
  5. Step 5: Solve for x
    x = 146,394,465.91/13,707.48
  6. Step 6: Final answer
    x = 10,679.90

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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.