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Finding the Fourth Proportional to 12,987.45, 18,678.60 and 12,987.45

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Solution

The fourth proportional to 12,987.45, 18,678.60 and 12,987.45 is: 18,678.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,987.45 : 18,678.60 = 12,987.45 : x
  2. Step 2: Convert to fraction form
    12,987.45/18,678.60 = 12,987.45/x
  3. Step 3: Cross multiply
    12,987.45x = 18,678.60 × 12,987.45
  4. Step 4: Simplify right side
    12,987.45x = 242,587,383.57
  5. Step 5: Solve for x
    x = 242,587,383.57/12,987.45
  6. Step 6: Final answer
    x = 18,678.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.44) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.