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Finding the Fourth Proportional to 28,087.30, 42,130.95 and 7,310.80

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Solution

The fourth proportional to 28,087.30, 42,130.95 and 7,310.80 is: 10,966.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,087.30 : 42,130.95 = 7,310.80 : x
  2. Step 2: Convert to fraction form
    28,087.30/42,130.95 = 7,310.80/x
  3. Step 3: Cross multiply
    28,087.30x = 42,130.95 × 7,310.80
  4. Step 4: Simplify right side
    28,087.30x = 308,010,949.26
  5. Step 5: Solve for x
    x = 308,010,949.26/28,087.30
  6. Step 6: Final answer
    x = 10,966.20

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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.