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Finding the Fourth Proportional to 55,915.80, 78,385.80 and 55,915.80

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Solution

The fourth proportional to 55,915.80, 78,385.80 and 55,915.80 is: 78,385.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,915.80 : 78,385.80 = 55,915.80 : x
  2. Step 2: Convert to fraction form
    55,915.80/78,385.80 = 55,915.80/x
  3. Step 3: Cross multiply
    55,915.80x = 78,385.80 × 55,915.80
  4. Step 4: Simplify right side
    55,915.80x = 4,383,004,715.64
  5. Step 5: Solve for x
    x = 4,383,004,715.64/55,915.80
  6. Step 6: Final answer
    x = 78,385.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.