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Finding the Fourth Proportional to 12,658.79, 18,987.94 and 3,780.14

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Solution

The fourth proportional to 12,658.79, 18,987.94 and 3,780.14 is: 5,670.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,658.79 : 18,987.94 = 3,780.14 : x
  2. Step 2: Convert to fraction form
    12,658.79/18,987.94 = 3,780.14/x
  3. Step 3: Cross multiply
    12,658.79x = 18,987.94 × 3,780.14
  4. Step 4: Simplify right side
    12,658.79x = 71,777,045.33
  5. Step 5: Solve for x
    x = 71,777,045.33/12,658.79
  6. Step 6: Final answer
    x = 5,670.13

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1.5x scale

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.