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Finding the Fourth Proportional to 10,490.80, 15,736.20 and 10,087.60

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Solution

The fourth proportional to 10,490.80, 15,736.20 and 10,087.60 is: 15,131.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,490.80 : 15,736.20 = 10,087.60 : x
  2. Step 2: Convert to fraction form
    10,490.80/15,736.20 = 10,087.60/x
  3. Step 3: Cross multiply
    10,490.80x = 15,736.20 × 10,087.60
  4. Step 4: Simplify right side
    10,490.80x = 158,740,491.12
  5. Step 5: Solve for x
    x = 158,740,491.12/10,490.80
  6. Step 6: Final answer
    x = 15,131.40

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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.