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Finding the Fourth Proportional to 1,316.07, 1,816.09 and 792

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Solution

The fourth proportional to 1,316.07, 1,816.09 and 792 is: 1,092.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.07 : 1,816.09 = 792 : x
  2. Step 2: Convert to fraction form
    1,316.07/1,816.09 = 792/x
  3. Step 3: Cross multiply
    1,316.07x = 1,816.09 × 792
  4. Step 4: Simplify right side
    1,316.07x = 1,438,341.30
  5. Step 5: Solve for x
    x = 1,438,341.30/1,316.07
  6. Step 6: Final answer
    x = 1,092.91

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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.