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Finding the Fourth Proportional to 78,955.25, 108,882.95 and 51,690.65

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Solution

The fourth proportional to 78,955.25, 108,882.95 and 51,690.65 is: 71,283.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,955.25 : 108,882.95 = 51,690.65 : x
  2. Step 2: Convert to fraction form
    78,955.25/108,882.95 = 51,690.65/x
  3. Step 3: Cross multiply
    78,955.25x = 108,882.95 × 51,690.65
  4. Step 4: Simplify right side
    78,955.25x = 5,628,230,200.96
  5. Step 5: Solve for x
    x = 5,628,230,200.96/78,955.25
  6. Step 6: Final answer
    x = 71,283.80

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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.