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Finding the Fourth Proportional to 85,661.28, 128,510.76 and 25,687.32

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Solution

The fourth proportional to 85,661.28, 128,510.76 and 25,687.32 is: 38,536.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,661.28 : 128,510.76 = 25,687.32 : x
  2. Step 2: Convert to fraction form
    85,661.28/128,510.76 = 25,687.32/x
  3. Step 3: Cross multiply
    85,661.28x = 128,510.76 × 25,687.32
  4. Step 4: Simplify right side
    85,661.28x = 3,301,097,015.56
  5. Step 5: Solve for x
    x = 3,301,097,015.56/85,661.28
  6. Step 6: Final answer
    x = 38,536.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.