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Finding the Fourth Proportional to 28,515.70, 42,773.55 and 7,739.20

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Solution

The fourth proportional to 28,515.70, 42,773.55 and 7,739.20 is: 11,608.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,515.70 : 42,773.55 = 7,739.20 : x
  2. Step 2: Convert to fraction form
    28,515.70/42,773.55 = 7,739.20/x
  3. Step 3: Cross multiply
    28,515.70x = 42,773.55 × 7,739.20
  4. Step 4: Simplify right side
    28,515.70x = 331,033,058.16
  5. Step 5: Solve for x
    x = 331,033,058.16/28,515.70
  6. Step 6: Final answer
    x = 11,608.80

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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.