Home / 31,376.18-43,290.69-18,618.77

Finding the Fourth Proportional to 31,376.18, 43,290.69 and 18,618.77

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Solution

The fourth proportional to 31,376.18, 43,290.69 and 18,618.77 is: 25,688.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,376.18 : 43,290.69 = 18,618.77 : x
  2. Step 2: Convert to fraction form
    31,376.18/43,290.69 = 18,618.77/x
  3. Step 3: Cross multiply
    31,376.18x = 43,290.69 × 18,618.77
  4. Step 4: Simplify right side
    31,376.18x = 806,019,400.25
  5. Step 5: Solve for x
    x = 806,019,400.25/31,376.18
  6. Step 6: Final answer
    x = 25,688.90

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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.