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Finding the Fourth Proportional to 85,643.28, 128,274.84 and 65,775.60

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Solution

The fourth proportional to 85,643.28, 128,274.84 and 65,775.60 is: 98,517.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,643.28 : 128,274.84 = 65,775.60 : x
  2. Step 2: Convert to fraction form
    85,643.28/128,274.84 = 65,775.60/x
  3. Step 3: Cross multiply
    85,643.28x = 128,274.84 × 65,775.60
  4. Step 4: Simplify right side
    85,643.28x = 8,437,354,565.90
  5. Step 5: Solve for x
    x = 8,437,354,565.90/85,643.28
  6. Step 6: Final answer
    x = 98,517.42

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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.