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Finding the Fourth Proportional to 91,272.60, 136,908.90 and 76,838.40

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Solution

The fourth proportional to 91,272.60, 136,908.90 and 76,838.40 is: 115,257.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,272.60 : 136,908.90 = 76,838.40 : x
  2. Step 2: Convert to fraction form
    91,272.60/136,908.90 = 76,838.40/x
  3. Step 3: Cross multiply
    91,272.60x = 136,908.90 × 76,838.40
  4. Step 4: Simplify right side
    91,272.60x = 10,519,860,821.76
  5. Step 5: Solve for x
    x = 10,519,860,821.76/91,272.60
  6. Step 6: Final answer
    x = 115,257.60

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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.