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Finding the Fourth Proportional to 68,710.40, 103,065.60 and 39,219.20

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Solution

The fourth proportional to 68,710.40, 103,065.60 and 39,219.20 is: 58,828.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,710.40 : 103,065.60 = 39,219.20 : x
  2. Step 2: Convert to fraction form
    68,710.40/103,065.60 = 39,219.20/x
  3. Step 3: Cross multiply
    68,710.40x = 103,065.60 × 39,219.20
  4. Step 4: Simplify right side
    68,710.40x = 4,042,150,379.52
  5. Step 5: Solve for x
    x = 4,042,150,379.52/68,710.40
  6. Step 6: Final answer
    x = 58,828.80

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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.