Home / 18,400.86-25,385.67-12,815.10

Finding the Fourth Proportional to 18,400.86, 25,385.67 and 12,815.10

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Solution

The fourth proportional to 18,400.86, 25,385.67 and 12,815.10 is: 17,679.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,400.86 : 25,385.67 = 12,815.10 : x
  2. Step 2: Convert to fraction form
    18,400.86/25,385.67 = 12,815.10/x
  3. Step 3: Cross multiply
    18,400.86x = 25,385.67 × 12,815.10
  4. Step 4: Simplify right side
    18,400.86x = 325,319,899.62
  5. Step 5: Solve for x
    x = 325,319,899.62/18,400.86
  6. Step 6: Final answer
    x = 17,679.60

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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.