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Finding the Fourth Proportional to 1,316.82, 1,816.92 and 985.53

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Solution

The fourth proportional to 1,316.82, 1,816.92 and 985.53 is: 1,359.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.82 : 1,816.92 = 985.53 : x
  2. Step 2: Convert to fraction form
    1,316.82/1,816.92 = 985.53/x
  3. Step 3: Cross multiply
    1,316.82x = 1,816.92 × 985.53
  4. Step 4: Simplify right side
    1,316.82x = 1,790,629.17
  5. Step 5: Solve for x
    x = 1,790,629.17/1,316.82
  6. Step 6: Final answer
    x = 1,359.81

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1.5x scale

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.