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Finding the Fourth Proportional to 11,128.80, 16,678.80 and 9,890.40

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Solution

The fourth proportional to 11,128.80, 16,678.80 and 9,890.40 is: 14,822.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,128.80 : 16,678.80 = 9,890.40 : x
  2. Step 2: Convert to fraction form
    11,128.80/16,678.80 = 9,890.40/x
  3. Step 3: Cross multiply
    11,128.80x = 16,678.80 × 9,890.40
  4. Step 4: Simplify right side
    11,128.80x = 164,960,003.52
  5. Step 5: Solve for x
    x = 164,960,003.52/11,128.80
  6. Step 6: Final answer
    x = 14,822.80

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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.