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Finding the Fourth Proportional to 12,656.80, 18,891.08 and 12,345.76

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Solution

The fourth proportional to 12,656.80, 18,891.08 and 12,345.76 is: 18,426.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,656.80 : 18,891.08 = 12,345.76 : x
  2. Step 2: Convert to fraction form
    12,656.80/18,891.08 = 12,345.76/x
  3. Step 3: Cross multiply
    12,656.80x = 18,891.08 × 12,345.76
  4. Step 4: Simplify right side
    12,656.80x = 233,224,739.82
  5. Step 5: Solve for x
    x = 233,224,739.82/12,656.80
  6. Step 6: Final answer
    x = 18,426.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.