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Finding the Fourth Proportional to 28,090.30, 42,135.45 and 7,313.80

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Solution

The fourth proportional to 28,090.30, 42,135.45 and 7,313.80 is: 10,970.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,090.30 : 42,135.45 = 7,313.80 : x
  2. Step 2: Convert to fraction form
    28,090.30/42,135.45 = 7,313.80/x
  3. Step 3: Cross multiply
    28,090.30x = 42,135.45 × 7,313.80
  4. Step 4: Simplify right side
    28,090.30x = 308,170,254.21
  5. Step 5: Solve for x
    x = 308,170,254.21/28,090.30
  6. Step 6: Final answer
    x = 10,970.70

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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.