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Finding the Fourth Proportional to 90,186.84, 135,119.76 and 76,904.46

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Solution

The fourth proportional to 90,186.84, 135,119.76 and 76,904.46 is: 115,219.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,186.84 : 135,119.76 = 76,904.46 : x
  2. Step 2: Convert to fraction form
    90,186.84/135,119.76 = 76,904.46/x
  3. Step 3: Cross multiply
    90,186.84x = 135,119.76 × 76,904.46
  4. Step 4: Simplify right side
    90,186.84x = 10,391,312,178.13
  5. Step 5: Solve for x
    x = 10,391,312,178.13/90,186.84
  6. Step 6: Final answer
    x = 115,219.83

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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.