Home / 5,215.50-7,197.31-2,978.68

Finding the Fourth Proportional to 5,215.50, 7,197.31 and 2,978.68

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Solution

The fourth proportional to 5,215.50, 7,197.31 and 2,978.68 is: 4,110.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,215.50 : 7,197.31 = 2,978.68 : x
  2. Step 2: Convert to fraction form
    5,215.50/7,197.31 = 2,978.68/x
  3. Step 3: Cross multiply
    5,215.50x = 7,197.31 × 2,978.68
  4. Step 4: Simplify right side
    5,215.50x = 21,438,483.35
  5. Step 5: Solve for x
    x = 21,438,483.35/5,215.50
  6. Step 6: Final answer
    x = 4,110.53

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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.