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Finding the Fourth Proportional to 58,428.80, 87,664.80 and 18,987.20

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Solution

The fourth proportional to 58,428.80, 87,664.80 and 18,987.20 is: 28,487.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    58,428.80 : 87,664.80 = 18,987.20 : x
  2. Step 2: Convert to fraction form
    58,428.80/87,664.80 = 18,987.20/x
  3. Step 3: Cross multiply
    58,428.80x = 87,664.80 × 18,987.20
  4. Step 4: Simplify right side
    58,428.80x = 1,664,509,090.56
  5. Step 5: Solve for x
    x = 1,664,509,090.56/58,428.80
  6. Step 6: Final answer
    x = 28,487.82

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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.