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Finding the Fourth Proportional to 18,663.90, 25,755.02 and 10,280.40

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Solution

The fourth proportional to 18,663.90, 25,755.02 and 10,280.40 is: 14,186.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,663.90 : 25,755.02 = 10,280.40 : x
  2. Step 2: Convert to fraction form
    18,663.90/25,755.02 = 10,280.40/x
  3. Step 3: Cross multiply
    18,663.90x = 25,755.02 × 10,280.40
  4. Step 4: Simplify right side
    18,663.90x = 264,771,907.61
  5. Step 5: Solve for x
    x = 264,771,907.61/18,663.90
  6. Step 6: Final answer
    x = 14,186.31

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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.