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Finding the Fourth Proportional to 638,016.75, 956,699.64 and 211,398.66

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Solution

The fourth proportional to 638,016.75, 956,699.64 and 211,398.66 is: 316,990.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,016.75 : 956,699.64 = 211,398.66 : x
  2. Step 2: Convert to fraction form
    638,016.75/956,699.64 = 211,398.66/x
  3. Step 3: Cross multiply
    638,016.75x = 956,699.64 × 211,398.66
  4. Step 4: Simplify right side
    638,016.75x = 202,245,021,918.48
  5. Step 5: Solve for x
    x = 202,245,021,918.48/638,016.75
  6. Step 6: Final answer
    x = 316,990.14

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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.