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Finding the Fourth Proportional to 1,317.92, 1,817.34 and 985.82

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Solution

The fourth proportional to 1,317.92, 1,817.34 and 985.82 is: 1,359.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.92 : 1,817.34 = 985.82 : x
  2. Step 2: Convert to fraction form
    1,317.92/1,817.34 = 985.82/x
  3. Step 3: Cross multiply
    1,317.92x = 1,817.34 × 985.82
  4. Step 4: Simplify right side
    1,317.92x = 1,791,570.12
  5. Step 5: Solve for x
    x = 1,791,570.12/1,317.92
  6. Step 6: Final answer
    x = 1,359.39

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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.