Home / 76,821.60-115,232.40-47,143.20

Finding the Fourth Proportional to 76,821.60, 115,232.40 and 47,143.20

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Solution

The fourth proportional to 76,821.60, 115,232.40 and 47,143.20 is: 70,714.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,821.60 : 115,232.40 = 47,143.20 : x
  2. Step 2: Convert to fraction form
    76,821.60/115,232.40 = 47,143.20/x
  3. Step 3: Cross multiply
    76,821.60x = 115,232.40 × 47,143.20
  4. Step 4: Simplify right side
    76,821.60x = 5,432,424,079.68
  5. Step 5: Solve for x
    x = 5,432,424,079.68/76,821.60
  6. Step 6: Final answer
    x = 70,714.80

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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.