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Finding the Fourth Proportional to 638,017.25, 956,700.39 and 211,399.16

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Solution

The fourth proportional to 638,017.25, 956,700.39 and 211,399.16 is: 316,990.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,017.25 : 956,700.39 = 211,399.16 : x
  2. Step 2: Convert to fraction form
    638,017.25/956,700.39 = 211,399.16/x
  3. Step 3: Cross multiply
    638,017.25x = 956,700.39 × 211,399.16
  4. Step 4: Simplify right side
    638,017.25x = 202,245,658,817.67
  5. Step 5: Solve for x
    x = 202,245,658,817.67/638,017.25
  6. Step 6: Final answer
    x = 316,990.89

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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.