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Finding the Fourth Proportional to 18,710.80, 25,822.72 and 13,986.88

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Solution

The fourth proportional to 18,710.80, 25,822.72 and 13,986.88 is: 19,303.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,710.80 : 25,822.72 = 13,986.88 : x
  2. Step 2: Convert to fraction form
    18,710.80/25,822.72 = 13,986.88/x
  3. Step 3: Cross multiply
    18,710.80x = 25,822.72 × 13,986.88
  4. Step 4: Simplify right side
    18,710.80x = 361,179,285.91
  5. Step 5: Solve for x
    x = 361,179,285.91/18,710.80
  6. Step 6: Final answer
    x = 19,303.25

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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.