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Finding the Fourth Proportional to 28,515.40, 42,773.10 and 8,792.20

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Solution

The fourth proportional to 28,515.40, 42,773.10 and 8,792.20 is: 13,188.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,515.40 : 42,773.10 = 8,792.20 : x
  2. Step 2: Convert to fraction form
    28,515.40/42,773.10 = 8,792.20/x
  3. Step 3: Cross multiply
    28,515.40x = 42,773.10 × 8,792.20
  4. Step 4: Simplify right side
    28,515.40x = 376,069,649.82
  5. Step 5: Solve for x
    x = 376,069,649.82/28,515.40
  6. Step 6: Final answer
    x = 13,188.30

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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.