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Finding the Fourth Proportional to 28,390.44, 39,178.80 and 15,643.80

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Solution

The fourth proportional to 28,390.44, 39,178.80 and 15,643.80 is: 21,588.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,390.44 : 39,178.80 = 15,643.80 : x
  2. Step 2: Convert to fraction form
    28,390.44/39,178.80 = 15,643.80/x
  3. Step 3: Cross multiply
    28,390.44x = 39,178.80 × 15,643.80
  4. Step 4: Simplify right side
    28,390.44x = 612,905,311.44
  5. Step 5: Solve for x
    x = 612,905,311.44/28,390.44
  6. Step 6: Final answer
    x = 21,588.44

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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.