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Finding the Fourth Proportional to 90,434.78, 135,671.62 and 30,469.22

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Solution

The fourth proportional to 90,434.78, 135,671.62 and 30,469.22 is: 45,710.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,434.78 : 135,671.62 = 30,469.22 : x
  2. Step 2: Convert to fraction form
    90,434.78/135,671.62 = 30,469.22/x
  3. Step 3: Cross multiply
    90,434.78x = 135,671.62 × 30,469.22
  4. Step 4: Simplify right side
    90,434.78x = 4,133,808,248.90
  5. Step 5: Solve for x
    x = 4,133,808,248.90/90,434.78
  6. Step 6: Final answer
    x = 45,710.38

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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.