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Finding the Fourth Proportional to 937.98, 1,405.76 and 808.79

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Solution

The fourth proportional to 937.98, 1,405.76 and 808.79 is: 1,212.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    937.98 : 1,405.76 = 808.79 : x
  2. Step 2: Convert to fraction form
    937.98/1,405.76 = 808.79/x
  3. Step 3: Cross multiply
    937.98x = 1,405.76 × 808.79
  4. Step 4: Simplify right side
    937.98x = 1,136,953.56
  5. Step 5: Solve for x
    x = 1,136,953.56/937.98
  6. Step 6: Final answer
    x = 1,212.13

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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.