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Finding the Fourth Proportional to 1,243.13, 1,715.57 and 683.63

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Solution

The fourth proportional to 1,243.13, 1,715.57 and 683.63 is: 943.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.13 : 1,715.57 = 683.63 : x
  2. Step 2: Convert to fraction form
    1,243.13/1,715.57 = 683.63/x
  3. Step 3: Cross multiply
    1,243.13x = 1,715.57 × 683.63
  4. Step 4: Simplify right side
    1,243.13x = 1,172,803.12
  5. Step 5: Solve for x
    x = 1,172,803.12/1,243.13
  6. Step 6: Final answer
    x = 943.43

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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.