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Finding the Fourth Proportional to 1,125.65, 1,553.10 and 683.75

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Solution

The fourth proportional to 1,125.65, 1,553.10 and 683.75 is: 943.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.65 : 1,553.10 = 683.75 : x
  2. Step 2: Convert to fraction form
    1,125.65/1,553.10 = 683.75/x
  3. Step 3: Cross multiply
    1,125.65x = 1,553.10 × 683.75
  4. Step 4: Simplify right side
    1,125.65x = 1,061,932.13
  5. Step 5: Solve for x
    x = 1,061,932.13/1,125.65
  6. Step 6: Final answer
    x = 943.39

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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.