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Finding the Fourth Proportional to 1,207.72, 1,666.38 and 683.56

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Solution

The fourth proportional to 1,207.72, 1,666.38 and 683.56 is: 943.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.72 : 1,666.38 = 683.56 : x
  2. Step 2: Convert to fraction form
    1,207.72/1,666.38 = 683.56/x
  3. Step 3: Cross multiply
    1,207.72x = 1,666.38 × 683.56
  4. Step 4: Simplify right side
    1,207.72x = 1,139,070.71
  5. Step 5: Solve for x
    x = 1,139,070.71/1,207.72
  6. Step 6: Final answer
    x = 943.16

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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.