Home / 31,138.40-42,971.10-16,991.48

Finding the Fourth Proportional to 31,138.40, 42,971.10 and 16,991.48

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Solution

The fourth proportional to 31,138.40, 42,971.10 and 16,991.48 is: 23,448.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,138.40 : 42,971.10 = 16,991.48 : x
  2. Step 2: Convert to fraction form
    31,138.40/42,971.10 = 16,991.48/x
  3. Step 3: Cross multiply
    31,138.40x = 42,971.10 × 16,991.48
  4. Step 4: Simplify right side
    31,138.40x = 730,142,586.23
  5. Step 5: Solve for x
    x = 730,142,586.23/31,138.40
  6. Step 6: Final answer
    x = 23,448.30

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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.