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Finding the Fourth Proportional to 28,312.90, 42,469.20 and 7,252.90

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Solution

The fourth proportional to 28,312.90, 42,469.20 and 7,252.90 is: 10,879.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,312.90 : 42,469.20 = 7,252.90 : x
  2. Step 2: Convert to fraction form
    28,312.90/42,469.20 = 7,252.90/x
  3. Step 3: Cross multiply
    28,312.90x = 42,469.20 × 7,252.90
  4. Step 4: Simplify right side
    28,312.90x = 308,024,860.68
  5. Step 5: Solve for x
    x = 308,024,860.68/28,312.90
  6. Step 6: Final answer
    x = 10,879.31

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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.