Home / 31,138.16-42,970.80-16,991.30

Finding the Fourth Proportional to 31,138.16, 42,970.80 and 16,991.30

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Solution

The fourth proportional to 31,138.16, 42,970.80 and 16,991.30 is: 23,448.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,138.16 : 42,970.80 = 16,991.30 : x
  2. Step 2: Convert to fraction form
    31,138.16/42,970.80 = 16,991.30/x
  3. Step 3: Cross multiply
    31,138.16x = 42,970.80 × 16,991.30
  4. Step 4: Simplify right side
    31,138.16x = 730,129,754.04
  5. Step 5: Solve for x
    x = 730,129,754.04/31,138.16
  6. Step 6: Final answer
    x = 23,448.07

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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.