Home / 1,317.40-1,975.14-667.78

Finding the Fourth Proportional to 1,317.40, 1,975.14 and 667.78

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Solution

The fourth proportional to 1,317.40, 1,975.14 and 667.78 is: 1,001.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.40 : 1,975.14 = 667.78 : x
  2. Step 2: Convert to fraction form
    1,317.40/1,975.14 = 667.78/x
  3. Step 3: Cross multiply
    1,317.40x = 1,975.14 × 667.78
  4. Step 4: Simplify right side
    1,317.40x = 1,318,958.99
  5. Step 5: Solve for x
    x = 1,318,958.99/1,317.40
  6. Step 6: Final answer
    x = 1,001.18

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.