Home / 20,877.58-28,816.59-12,915.28

Finding the Fourth Proportional to 20,877.58, 28,816.59 and 12,915.28

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Solution

The fourth proportional to 20,877.58, 28,816.59 and 12,915.28 is: 17,826.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,877.58 : 28,816.59 = 12,915.28 : x
  2. Step 2: Convert to fraction form
    20,877.58/28,816.59 = 12,915.28/x
  3. Step 3: Cross multiply
    20,877.58x = 28,816.59 × 12,915.28
  4. Step 4: Simplify right side
    20,877.58x = 372,174,328.50
  5. Step 5: Solve for x
    x = 372,174,328.50/20,877.58
  6. Step 6: Final answer
    x = 17,826.51

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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.