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Finding the Fourth Proportional to 18,390.65, 25,379.57 and 10,007.15

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Solution

The fourth proportional to 18,390.65, 25,379.57 and 10,007.15 is: 13,810.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,390.65 : 25,379.57 = 10,007.15 : x
  2. Step 2: Convert to fraction form
    18,390.65/25,379.57 = 10,007.15/x
  3. Step 3: Cross multiply
    18,390.65x = 25,379.57 × 10,007.15
  4. Step 4: Simplify right side
    18,390.65x = 253,977,062.05
  5. Step 5: Solve for x
    x = 253,977,062.05/18,390.65
  6. Step 6: Final answer
    x = 13,810.12

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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.