Home / 28,281.72-42,429.38-19,977.88

Finding the Fourth Proportional to 28,281.72, 42,429.38 and 19,977.88

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Solution

The fourth proportional to 28,281.72, 42,429.38 and 19,977.88 is: 29,971.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,281.72 : 42,429.38 = 19,977.88 : x
  2. Step 2: Convert to fraction form
    28,281.72/42,429.38 = 19,977.88/x
  3. Step 3: Cross multiply
    28,281.72x = 42,429.38 × 19,977.88
  4. Step 4: Simplify right side
    28,281.72x = 847,649,062.11
  5. Step 5: Solve for x
    x = 847,649,062.11/28,281.72
  6. Step 6: Final answer
    x = 29,971.62

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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.