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Finding the Fourth Proportional to 28,955.63, 39,931.43 and 18,891.78

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Solution

The fourth proportional to 28,955.63, 39,931.43 and 18,891.78 is: 26,052.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,955.63 : 39,931.43 = 18,891.78 : x
  2. Step 2: Convert to fraction form
    28,955.63/39,931.43 = 18,891.78/x
  3. Step 3: Cross multiply
    28,955.63x = 39,931.43 × 18,891.78
  4. Step 4: Simplify right side
    28,955.63x = 754,375,696.19
  5. Step 5: Solve for x
    x = 754,375,696.19/28,955.63
  6. Step 6: Final answer
    x = 26,052.82

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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.