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Finding the Fourth Proportional to 65,720.63, 90,679.61 and 38,864.27

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Solution

The fourth proportional to 65,720.63, 90,679.61 and 38,864.27 is: 53,623.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,720.63 : 90,679.61 = 38,864.27 : x
  2. Step 2: Convert to fraction form
    65,720.63/90,679.61 = 38,864.27/x
  3. Step 3: Cross multiply
    65,720.63x = 90,679.61 × 38,864.27
  4. Step 4: Simplify right side
    65,720.63x = 3,524,196,198.82
  5. Step 5: Solve for x
    x = 3,524,196,198.82/65,720.63
  6. Step 6: Final answer
    x = 53,623.90

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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.