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Finding the Fourth Proportional to 31,859.34, 43,978.08 and 21,245.10

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Solution

The fourth proportional to 31,859.34, 43,978.08 and 21,245.10 is: 29,326.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,859.34 : 43,978.08 = 21,245.10 : x
  2. Step 2: Convert to fraction form
    31,859.34/43,978.08 = 21,245.10/x
  3. Step 3: Cross multiply
    31,859.34x = 43,978.08 × 21,245.10
  4. Step 4: Simplify right side
    31,859.34x = 934,318,707.41
  5. Step 5: Solve for x
    x = 934,318,707.41/31,859.34
  6. Step 6: Final answer
    x = 29,326.37

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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.