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Finding the Fourth Proportional to 31,405.53, 43,350.03 and 20,658.30

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Solution

The fourth proportional to 31,405.53, 43,350.03 and 20,658.30 is: 28,515.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,405.53 : 43,350.03 = 20,658.30 : x
  2. Step 2: Convert to fraction form
    31,405.53/43,350.03 = 20,658.30/x
  3. Step 3: Cross multiply
    31,405.53x = 43,350.03 × 20,658.30
  4. Step 4: Simplify right side
    31,405.53x = 895,537,924.75
  5. Step 5: Solve for x
    x = 895,537,924.75/31,405.53
  6. Step 6: Final answer
    x = 28,515.29

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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.