Home / 129,931.63-194,915.90-39,981.80

Finding the Fourth Proportional to 129,931.63, 194,915.90 and 39,981.80

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Solution

The fourth proportional to 129,931.63, 194,915.90 and 39,981.80 is: 59,978.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,931.63 : 194,915.90 = 39,981.80 : x
  2. Step 2: Convert to fraction form
    129,931.63/194,915.90 = 39,981.80/x
  3. Step 3: Cross multiply
    129,931.63x = 194,915.90 × 39,981.80
  4. Step 4: Simplify right side
    129,931.63x = 7,793,088,530.62
  5. Step 5: Solve for x
    x = 7,793,088,530.62/129,931.63
  6. Step 6: Final answer
    x = 59,978.38

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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.