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Finding the Fourth Proportional to 13,658.40, 18,848.75 and 7,991.91

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Solution

The fourth proportional to 13,658.40, 18,848.75 and 7,991.91 is: 11,028.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,658.40 : 18,848.75 = 7,991.91 : x
  2. Step 2: Convert to fraction form
    13,658.40/18,848.75 = 7,991.91/x
  3. Step 3: Cross multiply
    13,658.40x = 18,848.75 × 7,991.91
  4. Step 4: Simplify right side
    13,658.40x = 150,637,473.65
  5. Step 5: Solve for x
    x = 150,637,473.65/13,658.40
  6. Step 6: Final answer
    x = 11,028.93

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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.