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Finding the Fourth Proportional to 80,783.40, 120,915.90 and 57,455.40

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Solution

The fourth proportional to 80,783.40, 120,915.90 and 57,455.40 is: 85,998.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,783.40 : 120,915.90 = 57,455.40 : x
  2. Step 2: Convert to fraction form
    80,783.40/120,915.90 = 57,455.40/x
  3. Step 3: Cross multiply
    80,783.40x = 120,915.90 × 57,455.40
  4. Step 4: Simplify right side
    80,783.40x = 6,947,271,400.86
  5. Step 5: Solve for x
    x = 6,947,271,400.86/80,783.40
  6. Step 6: Final answer
    x = 85,998.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.