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Finding the Fourth Proportional to 28,090.39, 42,135.45 and 7,313.89

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Solution

The fourth proportional to 28,090.39, 42,135.45 and 7,313.89 is: 10,970.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,090.39 : 42,135.45 = 7,313.89 : x
  2. Step 2: Convert to fraction form
    28,090.39/42,135.45 = 7,313.89/x
  3. Step 3: Cross multiply
    28,090.39x = 42,135.45 × 7,313.89
  4. Step 4: Simplify right side
    28,090.39x = 308,174,046.40
  5. Step 5: Solve for x
    x = 308,174,046.40/28,090.39
  6. Step 6: Final answer
    x = 10,970.80

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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.