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Finding the Fourth Proportional to 28,315.90, 42,473.70 and 7,255.90

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Solution

The fourth proportional to 28,315.90, 42,473.70 and 7,255.90 is: 10,883.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,315.90 : 42,473.70 = 7,255.90 : x
  2. Step 2: Convert to fraction form
    28,315.90/42,473.70 = 7,255.90/x
  3. Step 3: Cross multiply
    28,315.90x = 42,473.70 × 7,255.90
  4. Step 4: Simplify right side
    28,315.90x = 308,184,919.83
  5. Step 5: Solve for x
    x = 308,184,919.83/28,315.90
  6. Step 6: Final answer
    x = 10,883.81

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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.