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Finding the Fourth Proportional to 18,390.58, 25,379.25 and 10,006.90

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Solution

The fourth proportional to 18,390.58, 25,379.25 and 10,006.90 is: 13,809.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,390.58 : 25,379.25 = 10,006.90 : x
  2. Step 2: Convert to fraction form
    18,390.58/25,379.25 = 10,006.90/x
  3. Step 3: Cross multiply
    18,390.58x = 25,379.25 × 10,006.90
  4. Step 4: Simplify right side
    18,390.58x = 253,967,616.83
  5. Step 5: Solve for x
    x = 253,967,616.83/18,390.58
  6. Step 6: Final answer
    x = 13,809.66

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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.