Home / 31,138.92-42,971.40-16,991.64

Finding the Fourth Proportional to 31,138.92, 42,971.40 and 16,991.64

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Solution

The fourth proportional to 31,138.92, 42,971.40 and 16,991.64 is: 23,448.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,138.92 : 42,971.40 = 16,991.64 : x
  2. Step 2: Convert to fraction form
    31,138.92/42,971.40 = 16,991.64/x
  3. Step 3: Cross multiply
    31,138.92x = 42,971.40 × 16,991.64
  4. Step 4: Simplify right side
    31,138.92x = 730,154,559.10
  5. Step 5: Solve for x
    x = 730,154,559.10/31,138.92
  6. Step 6: Final answer
    x = 23,448.29

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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.