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Finding the Fourth Proportional to 28,160.65, 38,877.87 and 21,029.88

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Solution

The fourth proportional to 28,160.65, 38,877.87 and 21,029.88 is: 29,033.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,160.65 : 38,877.87 = 21,029.88 : x
  2. Step 2: Convert to fraction form
    28,160.65/38,877.87 = 21,029.88/x
  3. Step 3: Cross multiply
    28,160.65x = 38,877.87 × 21,029.88
  4. Step 4: Simplify right side
    28,160.65x = 817,596,940.76
  5. Step 5: Solve for x
    x = 817,596,940.76/28,160.65
  6. Step 6: Final answer
    x = 29,033.31

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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.