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Finding the Fourth Proportional to 58,090.70, 87,118.61 and 20,645.85

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Solution

The fourth proportional to 58,090.70, 87,118.61 and 20,645.85 is: 30,962.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    58,090.70 : 87,118.61 = 20,645.85 : x
  2. Step 2: Convert to fraction form
    58,090.70/87,118.61 = 20,645.85/x
  3. Step 3: Cross multiply
    58,090.70x = 87,118.61 × 20,645.85
  4. Step 4: Simplify right side
    58,090.70x = 1,798,637,977.73
  5. Step 5: Solve for x
    x = 1,798,637,977.73/58,090.70
  6. Step 6: Final answer
    x = 30,962.58

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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.