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Finding the Fourth Proportional to 12,888.40, 19,332.60 and 7,704.40

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Solution

The fourth proportional to 12,888.40, 19,332.60 and 7,704.40 is: 11,556.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,888.40 : 19,332.60 = 7,704.40 : x
  2. Step 2: Convert to fraction form
    12,888.40/19,332.60 = 7,704.40/x
  3. Step 3: Cross multiply
    12,888.40x = 19,332.60 × 7,704.40
  4. Step 4: Simplify right side
    12,888.40x = 148,946,083.44
  5. Step 5: Solve for x
    x = 148,946,083.44/12,888.40
  6. Step 6: Final answer
    x = 11,556.60

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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.