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Finding the Fourth Proportional to 85,764.80, 128,474.40 and 48,785.60

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Solution

The fourth proportional to 85,764.80, 128,474.40 and 48,785.60 is: 73,080.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,764.80 : 128,474.40 = 48,785.60 : x
  2. Step 2: Convert to fraction form
    85,764.80/128,474.40 = 48,785.60/x
  3. Step 3: Cross multiply
    85,764.80x = 128,474.40 × 48,785.60
  4. Step 4: Simplify right side
    85,764.80x = 6,267,700,688.64
  5. Step 5: Solve for x
    x = 6,267,700,688.64/85,764.80
  6. Step 6: Final answer
    x = 73,080.11

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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.