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Finding the Fourth Proportional to 18,385.94, 25,371.11 and 10,428.91

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Solution

The fourth proportional to 18,385.94, 25,371.11 and 10,428.91 is: 14,391.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,385.94 : 25,371.11 = 10,428.91 : x
  2. Step 2: Convert to fraction form
    18,385.94/25,371.11 = 10,428.91/x
  3. Step 3: Cross multiply
    18,385.94x = 25,371.11 × 10,428.91
  4. Step 4: Simplify right side
    18,385.94x = 264,592,985.43
  5. Step 5: Solve for x
    x = 264,592,985.43/18,385.94
  6. Step 6: Final answer
    x = 14,391.05

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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.