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Finding the Fourth Proportional to 92,987.72, 139,477.92 and 39,657.72

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Solution

The fourth proportional to 92,987.72, 139,477.92 and 39,657.72 is: 59,485.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,987.72 : 139,477.92 = 39,657.72 : x
  2. Step 2: Convert to fraction form
    92,987.72/139,477.92 = 39,657.72/x
  3. Step 3: Cross multiply
    92,987.72x = 139,477.92 × 39,657.72
  4. Step 4: Simplify right side
    92,987.72x = 5,531,376,297.54
  5. Step 5: Solve for x
    x = 5,531,376,297.54/92,987.72
  6. Step 6: Final answer
    x = 59,485.02

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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.