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Finding the Fourth Proportional to 74,987.72, 112,458.72 and 39,429.75

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Solution

The fourth proportional to 74,987.72, 112,458.72 and 39,429.75 is: 59,132.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,987.72 : 112,458.72 = 39,429.75 : x
  2. Step 2: Convert to fraction form
    74,987.72/112,458.72 = 39,429.75/x
  3. Step 3: Cross multiply
    74,987.72x = 112,458.72 × 39,429.75
  4. Step 4: Simplify right side
    74,987.72x = 4,434,219,518.02
  5. Step 5: Solve for x
    x = 4,434,219,518.02/74,987.72
  6. Step 6: Final answer
    x = 59,132.61

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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.