Home / 20,877.69-28,816.65-12,915.27

Finding the Fourth Proportional to 20,877.69, 28,816.65 and 12,915.27

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Solution

The fourth proportional to 20,877.69, 28,816.65 and 12,915.27 is: 17,826.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,877.69 : 28,816.65 = 12,915.27 : x
  2. Step 2: Convert to fraction form
    20,877.69/28,816.65 = 12,915.27/x
  3. Step 3: Cross multiply
    20,877.69x = 28,816.65 × 12,915.27
  4. Step 4: Simplify right side
    20,877.69x = 372,174,815.25
  5. Step 5: Solve for x
    x = 372,174,815.25/20,877.69
  6. Step 6: Final answer
    x = 17,826.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.