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Finding the Fourth Proportional to 830.53, 1,139.45 and 808.96

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Solution

The fourth proportional to 830.53, 1,139.45 and 808.96 is: 1,109.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.53 : 1,139.45 = 808.96 : x
  2. Step 2: Convert to fraction form
    830.53/1,139.45 = 808.96/x
  3. Step 3: Cross multiply
    830.53x = 1,139.45 × 808.96
  4. Step 4: Simplify right side
    830.53x = 921,769.47
  5. Step 5: Solve for x
    x = 921,769.47/830.53
  6. Step 6: Final answer
    x = 1,109.86

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.