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Finding the Fourth Proportional to 51,281.20, 76,921.80 and 45,740.80

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Solution

The fourth proportional to 51,281.20, 76,921.80 and 45,740.80 is: 68,611.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,281.20 : 76,921.80 = 45,740.80 : x
  2. Step 2: Convert to fraction form
    51,281.20/76,921.80 = 45,740.80/x
  3. Step 3: Cross multiply
    51,281.20x = 76,921.80 × 45,740.80
  4. Step 4: Simplify right side
    51,281.20x = 3,518,464,669.44
  5. Step 5: Solve for x
    x = 3,518,464,669.44/51,281.20
  6. Step 6: Final answer
    x = 68,611.20

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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.