Home / 28,405.80-39,270.87-21,319.92

Finding the Fourth Proportional to 28,405.80, 39,270.87 and 21,319.92

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Solution

The fourth proportional to 28,405.80, 39,270.87 and 21,319.92 is: 29,474.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,405.80 : 39,270.87 = 21,319.92 : x
  2. Step 2: Convert to fraction form
    28,405.80/39,270.87 = 21,319.92/x
  3. Step 3: Cross multiply
    28,405.80x = 39,270.87 × 21,319.92
  4. Step 4: Simplify right side
    28,405.80x = 837,251,851.61
  5. Step 5: Solve for x
    x = 837,251,851.61/28,405.80
  6. Step 6: Final answer
    x = 29,474.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.