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Finding the Fourth Proportional to 78,725.80, 108,640.90 and 42,915.80

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Solution

The fourth proportional to 78,725.80, 108,640.90 and 42,915.80 is: 59,223.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,725.80 : 108,640.90 = 42,915.80 : x
  2. Step 2: Convert to fraction form
    78,725.80/108,640.90 = 42,915.80/x
  3. Step 3: Cross multiply
    78,725.80x = 108,640.90 × 42,915.80
  4. Step 4: Simplify right side
    78,725.80x = 4,662,411,136.22
  5. Step 5: Solve for x
    x = 4,662,411,136.22/78,725.80
  6. Step 6: Final answer
    x = 59,223.42

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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.