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Finding the Fourth Proportional to 1,242.87, 1,715.51 and 712.05

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Solution

The fourth proportional to 1,242.87, 1,715.51 and 712.05 is: 982.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.87 : 1,715.51 = 712.05 : x
  2. Step 2: Convert to fraction form
    1,242.87/1,715.51 = 712.05/x
  3. Step 3: Cross multiply
    1,242.87x = 1,715.51 × 712.05
  4. Step 4: Simplify right side
    1,242.87x = 1,221,528.90
  5. Step 5: Solve for x
    x = 1,221,528.90/1,242.87
  6. Step 6: Final answer
    x = 982.83

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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.