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Finding the Fourth Proportional to 28,085.61, 42,128.42 and 19,293.87

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Solution

The fourth proportional to 28,085.61, 42,128.42 and 19,293.87 is: 28,940.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,085.61 : 42,128.42 = 19,293.87 : x
  2. Step 2: Convert to fraction form
    28,085.61/42,128.42 = 19,293.87/x
  3. Step 3: Cross multiply
    28,085.61x = 42,128.42 × 19,293.87
  4. Step 4: Simplify right side
    28,085.61x = 812,820,162.32
  5. Step 5: Solve for x
    x = 812,820,162.32/28,085.61
  6. Step 6: Final answer
    x = 28,940.81

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Similar ratio
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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.