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Finding the Fourth Proportional to 14,969.80, 20,656.92 and 8,681.50

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Solution

The fourth proportional to 14,969.80, 20,656.92 and 8,681.50 is: 11,979.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,969.80 : 20,656.92 = 8,681.50 : x
  2. Step 2: Convert to fraction form
    14,969.80/20,656.92 = 8,681.50/x
  3. Step 3: Cross multiply
    14,969.80x = 20,656.92 × 8,681.50
  4. Step 4: Simplify right side
    14,969.80x = 179,333,050.98
  5. Step 5: Solve for x
    x = 179,333,050.98/14,969.80
  6. Step 6: Final answer
    x = 11,979.66

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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.