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Finding the Fourth Proportional to 28,170.90, 42,242.70 and 14,124.90

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Solution

The fourth proportional to 28,170.90, 42,242.70 and 14,124.90 is: 21,180.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,170.90 : 42,242.70 = 14,124.90 : x
  2. Step 2: Convert to fraction form
    28,170.90/42,242.70 = 14,124.90/x
  3. Step 3: Cross multiply
    28,170.90x = 42,242.70 × 14,124.90
  4. Step 4: Simplify right side
    28,170.90x = 596,673,913.23
  5. Step 5: Solve for x
    x = 596,673,913.23/28,170.90
  6. Step 6: Final answer
    x = 21,180.51

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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.