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Finding the Fourth Proportional to 76,805.30, 115,280.85 and 47,280.80

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Solution

The fourth proportional to 76,805.30, 115,280.85 and 47,280.80 is: 70,966.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,805.30 : 115,280.85 = 47,280.80 : x
  2. Step 2: Convert to fraction form
    76,805.30/115,280.85 = 47,280.80/x
  3. Step 3: Cross multiply
    76,805.30x = 115,280.85 × 47,280.80
  4. Step 4: Simplify right side
    76,805.30x = 5,450,570,812.68
  5. Step 5: Solve for x
    x = 5,450,570,812.68/76,805.30
  6. Step 6: Final answer
    x = 70,966.08

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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.