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Finding the Fourth Proportional to 74,922.80, 112,326.60 and 42,090.80

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Solution

The fourth proportional to 74,922.80, 112,326.60 and 42,090.80 is: 63,103.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,922.80 : 112,326.60 = 42,090.80 : x
  2. Step 2: Convert to fraction form
    74,922.80/112,326.60 = 42,090.80/x
  3. Step 3: Cross multiply
    74,922.80x = 112,326.60 × 42,090.80
  4. Step 4: Simplify right side
    74,922.80x = 4,727,916,455.28
  5. Step 5: Solve for x
    x = 4,727,916,455.28/74,922.80
  6. Step 6: Final answer
    x = 63,103.84

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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.