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Finding the Fourth Proportional to 76,170.40, 105,114.87 and 42,636.40

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Solution

The fourth proportional to 76,170.40, 105,114.87 and 42,636.40 is: 58,838.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,170.40 : 105,114.87 = 42,636.40 : x
  2. Step 2: Convert to fraction form
    76,170.40/105,114.87 = 42,636.40/x
  3. Step 3: Cross multiply
    76,170.40x = 105,114.87 × 42,636.40
  4. Step 4: Simplify right side
    76,170.40x = 4,481,719,380.48
  5. Step 5: Solve for x
    x = 4,481,719,380.48/76,170.40
  6. Step 6: Final answer
    x = 58,838.07

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.