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Finding the Fourth Proportional to 65,586.72, 90,490.32 and 38,731.44

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Solution

The fourth proportional to 65,586.72, 90,490.32 and 38,731.44 is: 53,437.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,586.72 : 90,490.32 = 38,731.44 : x
  2. Step 2: Convert to fraction form
    65,586.72/90,490.32 = 38,731.44/x
  3. Step 3: Cross multiply
    65,586.72x = 90,490.32 × 38,731.44
  4. Step 4: Simplify right side
    65,586.72x = 3,504,820,399.66
  5. Step 5: Solve for x
    x = 3,504,820,399.66/65,586.72
  6. Step 6: Final answer
    x = 53,437.96

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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.