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Finding the Fourth Proportional to 28,235.76, 38,965.73 and 15,490.09

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Solution

The fourth proportional to 28,235.76, 38,965.73 and 15,490.09 is: 21,376.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,235.76 : 38,965.73 = 15,490.09 : x
  2. Step 2: Convert to fraction form
    28,235.76/38,965.73 = 15,490.09/x
  3. Step 3: Cross multiply
    28,235.76x = 38,965.73 × 15,490.09
  4. Step 4: Simplify right side
    28,235.76x = 603,582,664.62
  5. Step 5: Solve for x
    x = 603,582,664.62/28,235.76
  6. Step 6: Final answer
    x = 21,376.53

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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.