Home / 78,725.18-108,640.44-42,915.08

Finding the Fourth Proportional to 78,725.18, 108,640.44 and 42,915.08

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Solution

The fourth proportional to 78,725.18, 108,640.44 and 42,915.08 is: 59,222.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,725.18 : 108,640.44 = 42,915.08 : x
  2. Step 2: Convert to fraction form
    78,725.18/108,640.44 = 42,915.08/x
  3. Step 3: Cross multiply
    78,725.18x = 108,640.44 × 42,915.08
  4. Step 4: Simplify right side
    78,725.18x = 4,662,313,173.84
  5. Step 5: Solve for x
    x = 4,662,313,173.84/78,725.18
  6. Step 6: Final answer
    x = 59,222.64

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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.