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Finding the Fourth Proportional to 1,316.55, 1,813.08 and 985.77

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Solution

The fourth proportional to 1,316.55, 1,813.08 and 985.77 is: 1,357.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.55 : 1,813.08 = 985.77 : x
  2. Step 2: Convert to fraction form
    1,316.55/1,813.08 = 985.77/x
  3. Step 3: Cross multiply
    1,316.55x = 1,813.08 × 985.77
  4. Step 4: Simplify right side
    1,316.55x = 1,787,283.57
  5. Step 5: Solve for x
    x = 1,787,283.57/1,316.55
  6. Step 6: Final answer
    x = 1,357.55

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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.