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Finding the Fourth Proportional to 31,393.98, 47,106.99 and 20,871.18

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Solution

The fourth proportional to 31,393.98, 47,106.99 and 20,871.18 is: 31,317.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,393.98 : 47,106.99 = 20,871.18 : x
  2. Step 2: Convert to fraction form
    31,393.98/47,106.99 = 20,871.18/x
  3. Step 3: Cross multiply
    31,393.98x = 47,106.99 × 20,871.18
  4. Step 4: Simplify right side
    31,393.98x = 983,178,467.55
  5. Step 5: Solve for x
    x = 983,178,467.55/31,393.98
  6. Step 6: Final answer
    x = 31,317.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.