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Finding the Fourth Proportional to 28,652.70, 42,991.20 and 18,130.80

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Solution

The fourth proportional to 28,652.70, 42,991.20 and 18,130.80 is: 27,203.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,652.70 : 42,991.20 = 18,130.80 : x
  2. Step 2: Convert to fraction form
    28,652.70/42,991.20 = 18,130.80/x
  3. Step 3: Cross multiply
    28,652.70x = 42,991.20 × 18,130.80
  4. Step 4: Simplify right side
    28,652.70x = 779,464,848.96
  5. Step 5: Solve for x
    x = 779,464,848.96/28,652.70
  6. Step 6: Final answer
    x = 27,203.89

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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.