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Finding the Fourth Proportional to 78,215.91, 107,880.60 and 51,348.62

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Solution

The fourth proportional to 78,215.91, 107,880.60 and 51,348.62 is: 70,823.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,215.91 : 107,880.60 = 51,348.62 : x
  2. Step 2: Convert to fraction form
    78,215.91/107,880.60 = 51,348.62/x
  3. Step 3: Cross multiply
    78,215.91x = 107,880.60 × 51,348.62
  4. Step 4: Simplify right side
    78,215.91x = 5,539,519,395.37
  5. Step 5: Solve for x
    x = 5,539,519,395.37/78,215.91
  6. Step 6: Final answer
    x = 70,823.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.