Home / 5,421.78-8,132.70-1,317.78

Finding the Fourth Proportional to 5,421.78, 8,132.70 and 1,317.78

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Solution

The fourth proportional to 5,421.78, 8,132.70 and 1,317.78 is: 1,976.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,421.78 : 8,132.70 = 1,317.78 : x
  2. Step 2: Convert to fraction form
    5,421.78/8,132.70 = 1,317.78/x
  3. Step 3: Cross multiply
    5,421.78x = 8,132.70 × 1,317.78
  4. Step 4: Simplify right side
    5,421.78x = 10,717,109.41
  5. Step 5: Solve for x
    x = 10,717,109.41/5,421.78
  6. Step 6: Final answer
    x = 1,976.68

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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.