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Finding the Fourth Proportional to 85,851.20, 128,485.20 and 75,353.60

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Solution

The fourth proportional to 85,851.20, 128,485.20 and 75,353.60 is: 112,774.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,851.20 : 128,485.20 = 75,353.60 : x
  2. Step 2: Convert to fraction form
    85,851.20/128,485.20 = 75,353.60/x
  3. Step 3: Cross multiply
    85,851.20x = 128,485.20 × 75,353.60
  4. Step 4: Simplify right side
    85,851.20x = 9,681,822,366.72
  5. Step 5: Solve for x
    x = 9,681,822,366.72/85,851.20
  6. Step 6: Final answer
    x = 112,774.46

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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.