Home / 31,440.12-43,391.61-28,782.78

Finding the Fourth Proportional to 31,440.12, 43,391.61 and 28,782.78

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Solution

The fourth proportional to 31,440.12, 43,391.61 and 28,782.78 is: 39,724.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,440.12 : 43,391.61 = 28,782.78 : x
  2. Step 2: Convert to fraction form
    31,440.12/43,391.61 = 28,782.78/x
  3. Step 3: Cross multiply
    31,440.12x = 43,391.61 × 28,782.78
  4. Step 4: Simplify right side
    31,440.12x = 1,248,931,164.48
  5. Step 5: Solve for x
    x = 1,248,931,164.48/31,440.12
  6. Step 6: Final answer
    x = 39,724.12

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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.