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Finding the Fourth Proportional to 53,991.48, 80,987.76 and 18,931.98

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Solution

The fourth proportional to 53,991.48, 80,987.76 and 18,931.98 is: 28,398.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,991.48 : 80,987.76 = 18,931.98 : x
  2. Step 2: Convert to fraction form
    53,991.48/80,987.76 = 18,931.98/x
  3. Step 3: Cross multiply
    53,991.48x = 80,987.76 × 18,931.98
  4. Step 4: Simplify right side
    53,991.48x = 1,533,258,652.56
  5. Step 5: Solve for x
    x = 1,533,258,652.56/53,991.48
  6. Step 6: Final answer
    x = 28,398.16

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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.