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Finding the Fourth Proportional to 1,207.90, 1,666.86 and 683.90

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Solution

The fourth proportional to 1,207.90, 1,666.86 and 683.90 is: 943.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.90 : 1,666.86 = 683.90 : x
  2. Step 2: Convert to fraction form
    1,207.90/1,666.86 = 683.90/x
  3. Step 3: Cross multiply
    1,207.90x = 1,666.86 × 683.90
  4. Step 4: Simplify right side
    1,207.90x = 1,139,965.55
  5. Step 5: Solve for x
    x = 1,139,965.55/1,207.90
  6. Step 6: Final answer
    x = 943.76

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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.