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Finding the Fourth Proportional to 28,245.71, 42,368.80 and 7,185.77

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Solution

The fourth proportional to 28,245.71, 42,368.80 and 7,185.77 is: 10,778.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,245.71 : 42,368.80 = 7,185.77 : x
  2. Step 2: Convert to fraction form
    28,245.71/42,368.80 = 7,185.77/x
  3. Step 3: Cross multiply
    28,245.71x = 42,368.80 × 7,185.77
  4. Step 4: Simplify right side
    28,245.71x = 304,452,240.13
  5. Step 5: Solve for x
    x = 304,452,240.13/28,245.71
  6. Step 6: Final answer
    x = 10,778.71

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1.5x scale

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.