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Finding the Fourth Proportional to 685,640.40, 1,028,585.40 and 236,425.68

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Solution

The fourth proportional to 685,640.40, 1,028,585.40 and 236,425.68 is: 354,681.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,640.40 : 1,028,585.40 = 236,425.68 : x
  2. Step 2: Convert to fraction form
    685,640.40/1,028,585.40 = 236,425.68/x
  3. Step 3: Cross multiply
    685,640.40x = 1,028,585.40 × 236,425.68
  4. Step 4: Simplify right side
    685,640.40x = 243,184,002,633.07
  5. Step 5: Solve for x
    x = 243,184,002,633.07/685,640.40
  6. Step 6: Final answer
    x = 354,681.55

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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.