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Finding the Fourth Proportional to 90,990.70, 136,421.43 and 34,783.45

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Solution

The fourth proportional to 90,990.70, 136,421.43 and 34,783.45 is: 52,150.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,990.70 : 136,421.43 = 34,783.45 : x
  2. Step 2: Convert to fraction form
    90,990.70/136,421.43 = 34,783.45/x
  3. Step 3: Cross multiply
    90,990.70x = 136,421.43 × 34,783.45
  4. Step 4: Simplify right side
    90,990.70x = 4,745,207,989.33
  5. Step 5: Solve for x
    x = 4,745,207,989.33/90,990.70
  6. Step 6: Final answer
    x = 52,150.47

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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.