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Finding the Fourth Proportional to 18,886.31, 28,332.89 and 7,786.82

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Solution

The fourth proportional to 18,886.31, 28,332.89 and 7,786.82 is: 11,681.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,886.31 : 28,332.89 = 7,786.82 : x
  2. Step 2: Convert to fraction form
    18,886.31/28,332.89 = 7,786.82/x
  3. Step 3: Cross multiply
    18,886.31x = 28,332.89 × 7,786.82
  4. Step 4: Simplify right side
    18,886.31x = 220,623,075.58
  5. Step 5: Solve for x
    x = 220,623,075.58/18,886.31
  6. Step 6: Final answer
    x = 11,681.64

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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.