Home / 20,705.85-28,576.71-15,415.74

Finding the Fourth Proportional to 20,705.85, 28,576.71 and 15,415.74

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Solution

The fourth proportional to 20,705.85, 28,576.71 and 15,415.74 is: 21,275.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,705.85 : 28,576.71 = 15,415.74 : x
  2. Step 2: Convert to fraction form
    20,705.85/28,576.71 = 15,415.74/x
  3. Step 3: Cross multiply
    20,705.85x = 28,576.71 × 15,415.74
  4. Step 4: Simplify right side
    20,705.85x = 440,531,131.42
  5. Step 5: Solve for x
    x = 440,531,131.42/20,705.85
  6. Step 6: Final answer
    x = 21,275.68

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1.5x scale

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.