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Finding the Fourth Proportional to 18,658.51, 27,986.85 and 6,970.81

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Solution

The fourth proportional to 18,658.51, 27,986.85 and 6,970.81 is: 10,455.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,658.51 : 27,986.85 = 6,970.81 : x
  2. Step 2: Convert to fraction form
    18,658.51/27,986.85 = 6,970.81/x
  3. Step 3: Cross multiply
    18,658.51x = 27,986.85 × 6,970.81
  4. Step 4: Simplify right side
    18,658.51x = 195,091,013.85
  5. Step 5: Solve for x
    x = 195,091,013.85/18,658.51
  6. Step 6: Final answer
    x = 10,455.87

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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.