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Finding the Fourth Proportional to 65,720.16, 90,736.20 and 58,634.28

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Solution

The fourth proportional to 65,720.16, 90,736.20 and 58,634.28 is: 80,953.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,720.16 : 90,736.20 = 58,634.28 : x
  2. Step 2: Convert to fraction form
    65,720.16/90,736.20 = 58,634.28/x
  3. Step 3: Cross multiply
    65,720.16x = 90,736.20 × 58,634.28
  4. Step 4: Simplify right side
    65,720.16x = 5,320,251,756.94
  5. Step 5: Solve for x
    x = 5,320,251,756.94/65,720.16
  6. Step 6: Final answer
    x = 80,953.12

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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.