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Finding the Fourth Proportional to 14,231.80, 19,630.72 and 8,642.80

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Solution

The fourth proportional to 14,231.80, 19,630.72 and 8,642.80 is: 11,921.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,231.80 : 19,630.72 = 8,642.80 : x
  2. Step 2: Convert to fraction form
    14,231.80/19,630.72 = 8,642.80/x
  3. Step 3: Cross multiply
    14,231.80x = 19,630.72 × 8,642.80
  4. Step 4: Simplify right side
    14,231.80x = 169,664,386.82
  5. Step 5: Solve for x
    x = 169,664,386.82/14,231.80
  6. Step 6: Final answer
    x = 11,921.50

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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.