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Finding the Fourth Proportional to 12,587.80, 18,881.70 and 11,464.60

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Solution

The fourth proportional to 12,587.80, 18,881.70 and 11,464.60 is: 17,196.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,587.80 : 18,881.70 = 11,464.60 : x
  2. Step 2: Convert to fraction form
    12,587.80/18,881.70 = 11,464.60/x
  3. Step 3: Cross multiply
    12,587.80x = 18,881.70 × 11,464.60
  4. Step 4: Simplify right side
    12,587.80x = 216,471,137.82
  5. Step 5: Solve for x
    x = 216,471,137.82/12,587.80
  6. Step 6: Final answer
    x = 17,196.90

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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.