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Finding the Fourth Proportional to 77,280.40, 115,920.60 and 37,817.20

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Solution

The fourth proportional to 77,280.40, 115,920.60 and 37,817.20 is: 56,725.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,280.40 : 115,920.60 = 37,817.20 : x
  2. Step 2: Convert to fraction form
    77,280.40/115,920.60 = 37,817.20/x
  3. Step 3: Cross multiply
    77,280.40x = 115,920.60 × 37,817.20
  4. Step 4: Simplify right side
    77,280.40x = 4,383,792,514.32
  5. Step 5: Solve for x
    x = 4,383,792,514.32/77,280.40
  6. Step 6: Final answer
    x = 56,725.80

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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.