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Finding the Fourth Proportional to 25,458, 38,187.72 and 6,990

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Solution

The fourth proportional to 25,458, 38,187.72 and 6,990 is: 10,485.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,458 : 38,187.72 = 6,990 : x
  2. Step 2: Convert to fraction form
    25,458/38,187.72 = 6,990/x
  3. Step 3: Cross multiply
    25,458x = 38,187.72 × 6,990
  4. Step 4: Simplify right side
    25,458x = 266,932,162.80
  5. Step 5: Solve for x
    x = 266,932,162.80/25,458
  6. Step 6: Final answer
    x = 10,485.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.