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Finding the Fourth Proportional to 58,987.54, 81,420.60 and 40,135.60

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Solution

The fourth proportional to 58,987.54, 81,420.60 and 40,135.60 is: 55,399.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    58,987.54 : 81,420.60 = 40,135.60 : x
  2. Step 2: Convert to fraction form
    58,987.54/81,420.60 = 40,135.60/x
  3. Step 3: Cross multiply
    58,987.54x = 81,420.60 × 40,135.60
  4. Step 4: Simplify right side
    58,987.54x = 3,267,864,633.36
  5. Step 5: Solve for x
    x = 3,267,864,633.36/58,987.54
  6. Step 6: Final answer
    x = 55,399.24

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.