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Finding the Fourth Proportional to 813.53, 1,123.10 and 764.93

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Solution

The fourth proportional to 813.53, 1,123.10 and 764.93 is: 1,056.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.53 : 1,123.10 = 764.93 : x
  2. Step 2: Convert to fraction form
    813.53/1,123.10 = 764.93/x
  3. Step 3: Cross multiply
    813.53x = 1,123.10 × 764.93
  4. Step 4: Simplify right side
    813.53x = 859,092.88
  5. Step 5: Solve for x
    x = 859,092.88/813.53
  6. Step 6: Final answer
    x = 1,056.01

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.