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Finding the Fourth Proportional to 90,212.40, 135,246.51 and 42,803.64

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Solution

The fourth proportional to 90,212.40, 135,246.51 and 42,803.64 is: 64,171.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,212.40 : 135,246.51 = 42,803.64 : x
  2. Step 2: Convert to fraction form
    90,212.40/135,246.51 = 42,803.64/x
  3. Step 3: Cross multiply
    90,212.40x = 135,246.51 × 42,803.64
  4. Step 4: Simplify right side
    90,212.40x = 5,789,042,925.30
  5. Step 5: Solve for x
    x = 5,789,042,925.30/90,212.40
  6. Step 6: Final answer
    x = 64,171.26

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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.