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Finding the Fourth Proportional to 28,907.80, 43,412.90 and 21,125.40

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Solution

The fourth proportional to 28,907.80, 43,412.90 and 21,125.40 is: 31,725.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,907.80 : 43,412.90 = 21,125.40 : x
  2. Step 2: Convert to fraction form
    28,907.80/43,412.90 = 21,125.40/x
  3. Step 3: Cross multiply
    28,907.80x = 43,412.90 × 21,125.40
  4. Step 4: Simplify right side
    28,907.80x = 917,114,877.66
  5. Step 5: Solve for x
    x = 917,114,877.66/28,907.80
  6. Step 6: Final answer
    x = 31,725.52

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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.