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Finding the Fourth Proportional to 135,860.72, 203,503.80 and 85,915.04

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Solution

The fourth proportional to 135,860.72, 203,503.80 and 85,915.04 is: 128,690.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,860.72 : 203,503.80 = 85,915.04 : x
  2. Step 2: Convert to fraction form
    135,860.72/203,503.80 = 85,915.04/x
  3. Step 3: Cross multiply
    135,860.72x = 203,503.80 × 85,915.04
  4. Step 4: Simplify right side
    135,860.72x = 17,484,037,117.15
  5. Step 5: Solve for x
    x = 17,484,037,117.15/135,860.72
  6. Step 6: Final answer
    x = 128,690.89

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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.