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Finding the Fourth Proportional to 65,731.74, 90,728.39 and 38,883.59

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Solution

The fourth proportional to 65,731.74, 90,728.39 and 38,883.59 is: 53,670.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,731.74 : 90,728.39 = 38,883.59 : x
  2. Step 2: Convert to fraction form
    65,731.74/90,728.39 = 38,883.59/x
  3. Step 3: Cross multiply
    65,731.74x = 90,728.39 × 38,883.59
  4. Step 4: Simplify right side
    65,731.74x = 3,527,844,870.06
  5. Step 5: Solve for x
    x = 3,527,844,870.06/65,731.74
  6. Step 6: Final answer
    x = 53,670.34

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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.