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Finding the Fourth Proportional to 31,658.65, 43,675.76 and 20,918.20

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Solution

The fourth proportional to 31,658.65, 43,675.76 and 20,918.20 is: 28,858.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,658.65 : 43,675.76 = 20,918.20 : x
  2. Step 2: Convert to fraction form
    31,658.65/43,675.76 = 20,918.20/x
  3. Step 3: Cross multiply
    31,658.65x = 43,675.76 × 20,918.20
  4. Step 4: Simplify right side
    31,658.65x = 913,618,190.17
  5. Step 5: Solve for x
    x = 913,618,190.17/31,658.65
  6. Step 6: Final answer
    x = 28,858.41

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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.