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Finding the Fourth Proportional to 13,658.79, 18,849.48 and 7,690.68

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Solution

The fourth proportional to 13,658.79, 18,849.48 and 7,690.68 is: 10,613.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,658.79 : 18,849.48 = 7,690.68 : x
  2. Step 2: Convert to fraction form
    13,658.79/18,849.48 = 7,690.68/x
  3. Step 3: Cross multiply
    13,658.79x = 18,849.48 × 7,690.68
  4. Step 4: Simplify right side
    13,658.79x = 144,965,318.85
  5. Step 5: Solve for x
    x = 144,965,318.85/13,658.79
  6. Step 6: Final answer
    x = 10,613.34

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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.