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Finding the Fourth Proportional to 74,090.40, 111,254.40 and 68,632.80

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Solution

The fourth proportional to 74,090.40, 111,254.40 and 68,632.80 is: 103,059.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,090.40 : 111,254.40 = 68,632.80 : x
  2. Step 2: Convert to fraction form
    74,090.40/111,254.40 = 68,632.80/x
  3. Step 3: Cross multiply
    74,090.40x = 111,254.40 × 68,632.80
  4. Step 4: Simplify right side
    74,090.40x = 7,635,700,984.32
  5. Step 5: Solve for x
    x = 7,635,700,984.32/74,090.40
  6. Step 6: Final answer
    x = 103,059.25

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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.